Pecola doesn't want to be seen and begins imagining the day when she will disappear entirely from view.
Pecola begins to fixate on Shirley Temple's whiteness and her blue eyes as a way to get rid of her misery at being temporarily homeless. Pecola believes that having blue eyes will make her happy and beautiful, and will make her parents stop fighting.
It's becoming increasingly difficult for Pecola to imagine having a normal adolescence.
If Pecola's two major wishes were to disappear and to become beautiful so that she could be loved, Cholly's violation of her shatters both these dreams. By raping his own daughter, Cholly completely violates her trust and her ability to possess her own body in any real way.
While Pecola isn't literally destroyed, the pain of being raped by her father, losing her baby, and having to leave school is too much for her to bear. Pecola now exists in a complex fantasy world where she has blue eyes and an imaginary friend who tells her how pretty they are. No one in Lorain talks to her or looks her in the eyes anymore; she is completely and utterly ignored by everyone, including Pauline. Ironically, her initial wish to disappear has come true.