There are literally hundreds of these diaries and reminiscences available online and in libraries and collections. This is a short list of books that are generally available on major online bookstores such as Amazon and Barnes & Noble. Check to see if the book is also available for free on places like Kindle, Google Books or Archives.org.
Civil War Digital is a free resource that has many of these books and more.
Henrietta Fitzhugh Barr, The Civil War Diary of Mrs. Henrietta Fitzhugh Barr, 1862-63
Fannie A. Beers, Memories: A Record of Personal Experience and Adventure during Four Years of War
Belle Boyd, Bell Boyd in Camp and Prison
Kate Featherson Peddy, Saddle Bag and Spinning Wheel: Being the Civil War Letters of George W. Peddy and Kate Featherson Peddy
Phoebe Yates Pember: A Southern Woman's Story: Life in Confederate Richmond
Journal of Mrs. Eugenia Levy Phillips, 1861-1862
Margaret Junkin Preston, The Life and Letters of Margaret Junkin Preston
Sara Agnes (Mrs. Roger) Pryor, Reminiscences of Peace and War
Kate Stone, The Journal of Kate Stone, 1861-1868
Ella Gertrude Clanton Thomas, The Secret Eye: The Journal of Ella Gertrude Clanton Thomas, 1848-1889
Wright, Louise Wigfall. A Southern Girl in ’61: The War-Time Memories of a Confederate Senator’s Daughter
Maria Lydig Daly, Diary of a Union Lady, 1861-1865Civil War Digital is a free resource that has many of these books and more.
BOOKS WRITTEN BY CONFEDERATE LADIES
Baker, Cheryl Jackson, Affectionately Your’s: The Civil War Letters of William R. Jackson and His Wife JuliaHenrietta Fitzhugh Barr, The Civil War Diary of Mrs. Henrietta Fitzhugh Barr, 1862-63
Fannie A. Beers, Memories: A Record of Personal Experience and Adventure during Four Years of War
Belle Boyd, Bell Boyd in Camp and Prison
Bell Boyd, Confederate Spy
Laura Nisbet Boykin, Shinplasters and Homespun: Diary of Laura Nisbet Boykin
Mary Polk Branch, Memoirs of a Southern Woman "Within the Lines"
Lucy Buck; Sad Earth, Sweet Heaven: The Diary of Lucy Rebecca Buck
Mary Adelia Byers, Torn by War: The Civil War Journal of Mary Adelia Byers
Susan Caldwell, My Heart Is So Rebellious: The Caldwell Letters 1861-1865
Mary Chesnut, A Diary From Dixie
Anna Maria Cook, The Journal of a Milledgeville Girl, 1861-1867
Kate Cumming, Kate: The Journal of a Confederate Nurse
Belle Edmondson, A Lost Heroine of the Confederacy: The Diaries and Letters of Belle Edmondson
Catherine Ann Devereux Edmondston; Journal of a Secesh Lady: The Diary of Catherine Ann Devereux Edmondston, 1860-1866
Augusta Jane Evans, Augusta Evans Wilson, 1835-1909: A Biography
Mary Ann Harris Gay, Life in Dixie during the War
Rose O'Neal Greehow, My Imprisonment and the First Year of Abolition Rule at Washington
Parthenia Antoinette Hague, A Blockaded Family: Life in Southern Alabama During the Civil War
Elizabeath P. Hardin, The Private War of Lizzie Hardin: A Kentucky Confederate Girl's Diary of the Civil War in Kentucky, Virginia, Tennessee, Alabama, and Georgia
Emma Holmes, The Diary of Miss Emma Holmes, 1861-1866
Julia LeGrand, The Journal of Julia Le Grand, New Orleans, 1862-1863
Betty Herndon Maury, The Confederate Diary of Betty Herndon Maury, 1861-1863
Maverick, Mary A., Memoirs of Mary A. Maverick: A Journal of Early Texas
Cornelia Peake McDonald, A Woman's Civil War: A Diary, with Reminiscences of the War, from March 1862
Cotton, Gordon A. ed, From the Pen of a She-Rebel: The Civil War Dairy of Emilie Riley McKinley
Judith McGuire, Diary of a Southern Refugee during the War
McNeill, Sallie, The Uncompromising Diary of Sallie McNeill: 1858-1867
Sarah Morgan, The Civil War Diary of Sarah Morgan
Elizabeth Scott Neblett, A Rebel Wife in Texas: The Diary and Letters of Elizabeth Scott Neblett 1852-1864
Laetitia LaFon Ashmore Nutt, Courageous Journey: The Civil War Journal of Laetitia LaFon Ashmore Nutt
Laura Nisbet Boykin, Shinplasters and Homespun: Diary of Laura Nisbet Boykin
Mary Polk Branch, Memoirs of a Southern Woman "Within the Lines"
Lucy Buck; Sad Earth, Sweet Heaven: The Diary of Lucy Rebecca Buck
Mary Adelia Byers, Torn by War: The Civil War Journal of Mary Adelia Byers
Susan Caldwell, My Heart Is So Rebellious: The Caldwell Letters 1861-1865
Mary Chesnut, A Diary From Dixie
Anna Maria Cook, The Journal of a Milledgeville Girl, 1861-1867
Kate Cumming, Kate: The Journal of a Confederate Nurse
Belle Edmondson, A Lost Heroine of the Confederacy: The Diaries and Letters of Belle Edmondson
Catherine Ann Devereux Edmondston; Journal of a Secesh Lady: The Diary of Catherine Ann Devereux Edmondston, 1860-1866
Augusta Jane Evans, Augusta Evans Wilson, 1835-1909: A Biography
Mary Ann Harris Gay, Life in Dixie during the War
Rose O'Neal Greehow, My Imprisonment and the First Year of Abolition Rule at Washington
Parthenia Antoinette Hague, A Blockaded Family: Life in Southern Alabama During the Civil War
Elizabeath P. Hardin, The Private War of Lizzie Hardin: A Kentucky Confederate Girl's Diary of the Civil War in Kentucky, Virginia, Tennessee, Alabama, and Georgia
Emma Holmes, The Diary of Miss Emma Holmes, 1861-1866
Julia LeGrand, The Journal of Julia Le Grand, New Orleans, 1862-1863
Betty Herndon Maury, The Confederate Diary of Betty Herndon Maury, 1861-1863
Maverick, Mary A., Memoirs of Mary A. Maverick: A Journal of Early Texas
Cornelia Peake McDonald, A Woman's Civil War: A Diary, with Reminiscences of the War, from March 1862
Cotton, Gordon A. ed, From the Pen of a She-Rebel: The Civil War Dairy of Emilie Riley McKinley
Judith McGuire, Diary of a Southern Refugee during the War
McNeill, Sallie, The Uncompromising Diary of Sallie McNeill: 1858-1867
Sarah Morgan, The Civil War Diary of Sarah Morgan
Elizabeth Scott Neblett, A Rebel Wife in Texas: The Diary and Letters of Elizabeth Scott Neblett 1852-1864
Laetitia LaFon Ashmore Nutt, Courageous Journey: The Civil War Journal of Laetitia LaFon Ashmore Nutt
Kate Featherson Peddy, Saddle Bag and Spinning Wheel: Being the Civil War Letters of George W. Peddy and Kate Featherson Peddy
Phoebe Yates Pember: A Southern Woman's Story: Life in Confederate Richmond
Journal of Mrs. Eugenia Levy Phillips, 1861-1862
Margaret Junkin Preston, The Life and Letters of Margaret Junkin Preston
Sara Agnes (Mrs. Roger) Pryor, Reminiscences of Peace and War
Kate Stone, The Journal of Kate Stone, 1861-1868
Wright, Louise Wigfall. A Southern Girl in ’61: The War-Time Memories of a Confederate Senator’s Daughter
BOOKS WRITTEN BY UNION LADIES
Hannah Ropes, Civil War Nurse: The Diary and Letters of Hannah Ropes
Harriet Eaton, This Birth Place of Souls: The Civil War Nursing Diary of Harriet Eaton
Louisa May Alcott, Hospital Sketches
Frances Dallam Peter, A Union Woman in Civil War Kentucky: The Diary of Frances Peter
Caroline Cowles Richards, Village Life in America 1852-1872 Including the period of the American Civil War as told in the diary of a school-girl
Sarah Jane Full Hill, Mrs. Hill's journal: Civil War reminiscences
Mary A. Livermore, My Story Of The War: The Civil War Memoirs Of The Famous Nurse, Relief Organizer, And Suffragette
James C. Mohr, Ed., The Cormany Diaries: A Northern Family in the Civil War
James C. Mohr, Ed., The Cormany Diaries: A Northern Family in the Civil War
Cornelia Hancock, Letters of a Civil War Nurse: Cornelia Hancock, 1863-1865
Salome Myers Stewart, The Ties of the Past: The Gettysburg Diaries of Salome Myers Stewart, 1854-1922
G. W. Cable, Ed., War Diary of a Union Woman in the South
Georgeanna Woolsey Bacon & Eliza Woolsey Howland, My Heart Toward Home: Letters of a Family During the Civil War
G. W. Cable, Ed., War Diary of a Union Woman in the South
Richard L. Kiper, Ed., Dear Catharine, Dear Taylor: The Civil War Letters of a Union Soldier and his Wife
Georgeanna Woolsey Bacon & Eliza Woolsey Howland, My Heart Toward Home: Letters of a Family During the Civil War
Clara Barton, The Story of the Red Cross
Clara Barton, The Story of My Childhood