To tell the truth I think Roxxy is not so by nature. I mean she is cleary one of the most beauty in the school, but i think she has such a character/personality. Only because of the way she lives. She hopes that by staying with the football team leader, she may perhaps make her change her life. Since, as we have seen, it is not that she lives so well. The mother will be a half-drunk, she does not know her father. It is logical that she grew up with a distorted view of what the right guy is for her. I believe that underneath instead Roxxy has a sweet character. But we will only discover it by completing her story.
Something like, at the beginning it will be very hard, but as it goes on, she will begin to show her true character or personality. Roxxy is like Summer in the O.C or Lydia in Teen Wolfs (if someone knows those two TV series). The both stay with some important guys in the school so the look always like, who the fuck you want from me! But then secretly she where sweet.