There is a biography entitled, "The True Story of Mary, Wife of Lincoln," containing the Recollections of Mary Lincoln's Sister Emilie (Mrs. Ben Hardin Helm), Extracts from her War-Time Diary, Numerous Letters and Other Documents now First Published by Her Niece, Katherine Helm, (1928), New York & London, Harper & Brothers Publishers.
"Lady of Lincoln,
They wreathed her head
With thorns when living,
With nettles though dead."
-- Marion Mills Miller
It is quite interesting with many illustrations including a copy of a lovely portrait of Mary Todd Lincoln at the time of the first inauguration painted by her niece, Katherine Helm. It was presented by Mr. and Mrs. Robert Todd Lincoln to the people of the United States.
There are also excerpts from newspaper articles of the day.