I did something horrible to a clmate?

awwhh. man that sucks. You should tell her the truth and just say you're sorry and beg her not to tell on you. I think that's the only way because if she tells her parents and they sue you, you might have to pay a lot for bail because I think this is against the law. You should just admit you were part of it but try not to bring your friend into this because you're her BFFL(: your friendship might be broken if you tell people that your friend was part of it too.