The most enduring image of Leslie is the portrait of her, posing as Little Lord Fauntleroy, painted by William Merritt Chase.

[2] Leslie had pen pals everywhere with whom she maintained a lively correspondence, including leading actors, actresses and statesmen.

"[3] Two of her correspondents were young girls nearer her own age, one younger, the other a year older: Eleanor Roosevelt and Helen Keller.

[4] Leslie took a break from acting, but returned to the stage in 1898 to play parts in The Rivals, The Cricket on the Hearth, The Christian, The Taming of the Shrew, The Man on the Case in 1907, and Louis N. Parker's Disraeli with George Arliss in 1911; but after years away from the stage she could not recapture the old magic as an adult.

Photographs of Leslie, parts of her diary, along with letters and cards from Mark Twain, Helen Keller, Edwin Booth, William Gillette, Elliott Roosevelt and Joseph Jefferson, are recorded in Trustable & Preshus Friends.