Mrs Flaversham was, presumably, a female sentient mouse.
Mrs Flaversham was likely once married to toymaker Hiram Flaversham. They had a daughter, Olivia Flaversham. However, Olivia never knew her mother, implying that Mrs Flaversham died, likely in childbirth.
- Some people have theorized that Olivia's mother is actually Miss Kitty Mouse, though the dancer's age doesn't quite seeem to fit with Hiram Flaversham's.