This may be way too late, But for the idea.
You should have her parents pass away in a bad accident, And she finally gets her act together.
She exposes her "boyfriend" as the cheater he is.
Stops the partying.
Quit cheerleading for a while. (Have the time be a year after the crash)
And then have her fall in love with the guy she thinks is way out of her league, have her be afraid to open up to him about her actions and her past.
Make her personality be more, Caring, Confident, Sweet, And just a better amazing girl.
Then have some relationship bumps. And friendships.
Some bullying at school about her parents and her leaving her old rep.
Have her stay friends with Sammy, And have her befriend her new boyfriends friends and make new ones.
Have her set up for a huge goal for college for being a lawyer or nurse, and just have it be almost cliche but with a twist.
Hope this was good