That's normal, right?

So I was just writing to a friend, then we were talking about our favorite food and then she said that this morning she ate muesli and for lunch she had pasta Bolognese and for dinner she had bread with cream cheese and sausage, then she asked me what I ate today and then I said that this morning I ate 3 breads (not that big) with Nutella and cornflakes with chocolate and for lunch I had pizza and fries and for dessert ice cream with chocolate sauce and then for dinner I had a Nutella bread and I also ate 2 salami breads and some chocolate because I was hungry, then she said that I should eat less because I'm already fat, then I asked her what I had done to her and then she stopped answering, blocked me everywhere and everyone in the class is now on her page, everyone has stopped writing to me, everyone has blocked me and kicked me out of the class group, that's really annoying me, a teacher just called me and asked me why I hit my friend even though I didn't do it, then I said that I didn't do it, then the teacher said that I should stop lying and that he would inform my parents about all the stupid things I was doing at school, then he said that I vape, smoke, alcohol, and take drugs, even though it wasn't true, and my mom is coming home in 20 minutes, and I'm afraid she'll get me in trouble because she'll probably believe it because the teacher is calling her…

What should I do now? I just deleted the chat with my girlfriend out of anger and I don't know what to say to her.