One of my closest friends told me that she wanted to kill herself because of me. She described the cuts she 'dedicated' to me, and even began turning friends away. We went into hs, and now she's spreading bad rumors. What do I do?

I did, but that was when she started explaining to me that she'd dedicated cuts to me.  She wrote letters calling me trash, a b****, a coward, and that I didn't deserve to live.  It affected me and all of those close to me.  We had a whole drama with the school counselor, and the principal became involved when she slapped my friend.  Her parents knew, my parents knew, and there were all sorts of people involved, including a child psychologist.  Recently, she was elected for freshman class council, and now I see her everywhere.  It makes me feel horrible, that she wasn't even punished for what she made me feel.  I would be fine with it eventually, but now I'm hearing things about how I am a horrible friend.  I wanted to leave all of it behind in middle school, but now it's starting to affect my life in hs, and even my grades.