What does Diana reveal to Natalie in their brief scene in Act 2, Scene 11?

In Act 2, Scene 11, Diana meets Natalie, telling her that she's going to take Natalie to the dance, and that it's time for her to find her own happiness. When Natalie protests, Diana sings ("Maybe / Next to Normal") that she doesn't know where she's at, that she's tired of trying to live by other people's rules, and that she sees herself in Natalie, a girl who might someday be free.