To what fairy tale character does Phyllisia compare Edith in The Friends, and why might Phyllisia prefer to think about Edith this way?

Phyllisia compares her friend, Edith, to the fairy tale
character, Cinderella. It is probably a fair comparison, since Edith's innate
friendliness toward Phyllisia presents a side that differs from Edith's outward
appearance. Like Cinderella, Edith is a plain, common girl who works hard to help her
family. Like Cinderella, Edith is a good person who has dreams of bettering herself by
escaping from the realities of her lower-class world. Edith is fascinated that Phyl's
mother allows her to wear silk stocking and high heels, and the acquisition of stockings
suddenly becomes a goal of Edith's--a bit of luxury that can help her forget her poor
home life, much like Cinderella's glass slipper becomes a reminder of her short, magical
evening.