In the novel Speak by Laurie Anderson, what are some examples of Melinda portraying herself differently on the outside than internally?

Its been years since I read this book or did a lesson on it, but if I remember correctly, Melinda was raped at a party by a guy that Heather likes. When Heather and Rachel find out, they sort of stop being her friend. Melinda doesn't talk at all to anyone after that event. The comparison of there three personalities are typical of that age group and status. They are all attention seeking teenagers trying to fit in and be cool with boys. When Melinda replays the night in her mind, she knows that she wanted to make out with the guy, goes into a room with him at a party, but doesn't want to go all the way. The mood and her choices kind of lead you to believe that she is not telling the truth. However, you have no reason not to believe her either. After she stops talking, you see a different side of her that she never let out when she was trying to fit in. You see an artistic side of her when she finds a place in the school where she can be alone. In the other two girls, you see them still trying to fit in with the boys. One of them gets involved with the guy who raped Melinda. She ends up having sex with him. The other girl Rachel is the highest ranking girl of the three. Her status is popular among all her friends and she sort of sets the stage for what the majority will believe. If she says it, then it must be true. However, she also has a very close knit family and not much freedom so most of what she shows others is a rebellion against what is trying to be forced upon her at home.