I (15 F white) have a friend/classmate (15 F black) called Amy. (All names are fake) Basically, we we're playing capture the flag for PE. We we're on different teams, and she had just ran to my side. I ended up catching her by 3 braids and held on to make sure she knew she was caught. (She is known for lying about not being caught) Turns out I accidentally hurt her, I ended up apologising and she claimed everything was fine. Fast forward, we're going to lunch. Amy is in front of me by about 1ish meters (about 3 feet). Our other classmate Sara ends up shoving me out of the way to be with Amy. I tell her to not shove me and go to the back of the line. Both Sara and Amy state that Sara didn't shove me, I end up saying something that I can't remember and we start going to lunch.W When we're going up some stairs to lunch, I try going to the highest step like I always do. Amy ends up purposefully elbowing me in my chest and slightly smirks. I start yelling at her to not elbow me. Our teacher endsupe hearing me and gives me a death stare. When we go in, we go to the sinks to wash our hands and I overhear them talking shit about me. I tell them to just shut the fuck up, and Amy says she'll tell our teacher that I swore. (Our teacher hates swearing) She ends up telling the teacher and I get told off. I end up ignoring Amy and Sara for the rest of the day. After school, Amy ends up messaging me saying "I didn't ask" To my message yesterday stating that I couldn't come over to her house that day. I end up telling her to fuck off and she responds with, "fuck yourself". It escelates and I tell her that I should have ripped her 3 braids out during PE. She sends me a voice message saying that I threatened her. In the same voice message, she tells me that she would rip my head off in school the next day. (So a dath threat). I tell her that she deserves to de a slow painful death. She ends up taking screenshots of the messages were I look like the bad guy and sends them to our class group chat. After that she texts me a message calling me a he. I ask her if she knows what a he is. She said it was the definition of me. I tell her that I don't want to waste my time on her. When I'm about to block her she sends me a voice message saying that I like a boy called Liam. (I don't like him and I've gotten shipped with him since we were 10) She said that I constantly stare at him in class. I in fact don't, he is sitting right in front of a window that I look out of. If I ever do stare at him, it's because he's pissed me off and I feel like punching him. (Ps he is my guy best friend) After a bit, Sara messages me saying that I should open a bible. (I do not believe in God and am not religeous) She also says that if Amy hurt me then "womp womp lil bro". (She said that because in the messages I sent Amy, I stated that she has put me through hell. I do not know what to do in this situation. This happened about a week or two ago. AITA? And please help me decide what to do.

Edit: I noticed that I left some things out by mistake. First off, responding to a comment about the skin color. In a voice message she consistently called me racist for no reason, she also kept making remarks about my "privileges as a white girl". She had also stated that if I said anything back to her about that then I would be racist. Another comment said that I purposely hurt her, I didn't. She stated herself that if I did hold her hair then she would have faked not being caught and would have got away with it. I also did try talking with the teacher but Amy and Sara got to her first and told a twisted story. When I tried to tell the teacher what happened, she told me to stop lying.