A woman who lives across the street from the cemetery where Willie Lincoln is interred. Saunders quotes from Isabelle’s (fictive) letter to her brother, in which she explains seeing not only Willie’s funeral procession, but also the president himself exiting the graveyard late at night. Isabelle is quite sickly, though she’s a young woman, and so she has trouble sleeping. As such, she waits up while sitting by the window, where she can see the cemetery and, in the foreground, the groundskeeper’s house, where Manders lives.