Shallow

Casper and his gang called her Mc'fat since the fourth grade. After all the years of bulling, torment and being called Mc' Fat, Abby stayed strong and focused on her studies and being a good student, and daughter to her now deceased mother.
Abby decides that she's had enough and can't take anymore, taking advantage of summer break, Abby looses her pounds completely baffling her classmates and tormenters.
Now that she looks considerably good, everyone either wants to be her friend or get her in bed; that doesn't exclude Casper.
Apparently he doesn't think anything wrong of the way he's treated her in the past.