This girl who was crazy about me enrolled at my school again. i kinda like her?

First things first, you really shouldn't have been mean to her at all. Appearances are one thing, but what matters is personality. If you really like her, you've got to talk to her and say how sorry you are for everything you did to her in the past (as long as it's true!) and see how far that takes you. It's likely that she'll throw it back in your face, I know I would, but it's worth a try I guess.