The Handmaid's Tale
by Margaret Atwood
Aunt Elizabeth is one of the women in charge at the Center. She doesn't make as big an impression on the narrator as Aunt Lydia does, and she seems to get stuck with bathroom guard duty quite frequently. She happens to be on duty the day Moira makes her second escape from the Center, so she's the one who is gagged and bound in the furnace room while Moira steals her clothes and walks out, impersonating her.