My (ex)-Best-friend hates me now? Help me please?

I would just be done with her if I were you. She seems over dramatic to me, (maybe she's not it just sounds like it) I'm a bit older than you 2 but, if this girl is going to cause you drama, and make you start cutting again, she's not going to be worth your time. Ignore her, surround yourself with real friends, and try and forget about it. Your Emma friend might realize what a great friend she lost and what a big mistake she made, don't let her make you feel bad and bring your down. But if you 2 can work this problem out by all means continue to be friends if she is your real friend she'll look past this, but if she ever makes you go to drastic measures and makes you feel bad about yourself, remember she really isn't worth it, at this age everyone seems fake. It's tough when it comes to friends and fights.