Fighting at school?

A girl at my highschool really hates me, waits for me and is harassing me, following me and waiting outside my lessons, she wants a fight with me. I've tried everything, gone to teachers, they've talked to her but it's no use, she is relentless.

I know I could take her, she's skinny and small and a year younger. But i have always doubted myself and my own strength. Also, I'm fragile and have been known to cry at things like this. I'm scared of losing and looking weak because I'm being bullied already.

Basically, what moves can I pull to get the fight over and done with quickly and easily? This girl worried me so much I've even considered breaking a bone so that she is off school a couple of months and would never fuck with me again.

I know that violence is not the answer, a fight is the last thing I want but its the first thing she wants and there's no avoiding it.
Fighting at school?
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