CoNFUSED student vs. student/teacher

Hello everyone, I'm christina. I have a big problem. I and my friends were accused with hacking on facebook with someones account (which is true). Firts, the reason why I hacke that account because we suspected her that she is telling someone about us which is not goo one "paninira". Now she told us that we need to return her facebook and she gave us a deadline, so that there are no more trouble. Knowing her, she has no word of honor, so we have decided not to return her account. In hacking her account, we have just confirmed our suspicion. Now my question is, we will be facing soon together with the teachers, and we want to deny it so what would i do?, and if she has really evidences, can we use what she told to someone about us? somewhat suing defamation vs. Invading of privacy?.. and last thing we have a teacher who is just taking only her side, she even make "parinig" can we send a complain to prc to fire her ? thank you so much

how did you get her password?