Who is Matilda from Friend of My Youth: Stories and what is their importance?

Matilda also grew up with a difficult mother. Her mother insisted on making a big deal out of Matilda's beauty, and showing it off to the world. Matilda, like Joan and Morris, must have been constantly told how she was special, and better than other people. Matilda's mother demonstrated this fact when she sent Morris home, saying that her daughter was not desperate enough to go to the dance with a "deadeye dick". Unlike Joan, however, Matilda abandoned her beauty as soon as she could.