What are your opinions?

So, me and my friend have this friend that is quite unstable. She has a lot of moodswings and when she's upset about something, she would talk to us as if we were her maids when we talk to her. Not only that but she also ruins the fun whenever our classmates get together joking and messing around. We have our prides. So we started distancing her. We talk to each other about what we dislike about her speech whenever she's upset. And we were immature. We were underage but she was 18! She was acting more childish than us. She also started distancing herself from us.

I guess I crossed the line calling her "witch" because she always magically and successfully ruins the fun. She heard that and a few days later, confronted us. I cut ties with her but my friend was confused about that sudden confrontation so she didn't. The next day, she didn't come to school so me and that friend were alone. It was awkward. But what's even awkward is that after the first period, she hugged me and cried and said "let's be friends. I won't do that again." In front of everyone. So I agreed to be friends and promised eachother not to do that again.

I also apologised to her at the end of the semester and promised her. And lately, she's been shading us a lot. When my classmate said "the cat is mean like you", she hit back with "Yeah, I am mean. But only mean to those who are mean to me. And some retards thanks they are saints. And today, our teacher said the same and she replied, "yeah. I'm mean but I don't stab people's back."

She said to forget this matter between us but she's been shading a lot.