Is that how self-centred some girls are?
I mean, Mandi was ruining a girl's chances at a top university, sabotaging her dad's career, got her expelled and framed her for the theft of almost $7000. And all for what? So she could be prom queen and because Jo didn't want to be friends with her? She flat out admitted that she damaged the car so the family would get no income and Jo would have to leave. I'm near the same age as Jo and no one in my school would be that mean over something so trivial.
I swear it's happening in all teen movies. I saw Princess Protection Program (don't judge me) and one girl threatened to reveal the fact that a girl was a princess who had run away from her country and would be put in prison by the man that took her throne if she went back, again just to become prom queen. Who even cares that much about being prom queen? It's a small moment of glory and a plastic crown, nothing to get people deported/arrested over just to win. Like Jo said, even if she had done all that she would have only won by default.