Brat help! btw im a girl despite the name!?

OK this girl michelle who goes to my school we used to be friends but then my friend johna and her got in a fight. So I got mad at her and she was mad at me and so her and johna made up then she thought oh well me and her can be friends again. NO! But i wanted to know what she is saying about Johna so i pretended to be her friend and Natalie who was our other friend told her. She not my friend anymore and of course michelle is being a huge brat about it just because i don't want to be her friend! Well ok she stole my notebook lol and i waited until after she left after last hour and i stole it back lol she is going to be so mad lol! Cant wait until tomorrow! She is threatenings me saying im can so kill you right now because she said what are you looking at! and i said a whole lot of ugly! she said well i don't know what your looking at? i pointed at her and said all that pure ugly! her boyfriend said my name and i said shut up and michelle said i could so smoke you right now lol i said under my breath a few Choice words and your just running your mouth and another Choice word lol! she also threatens to send me home with a bloody face and told my cousin to tell my mom that she wont pay my medical bills lol thats a load of crap! my friend Vanessa said michelle is a real choise word since she started hanging with Hannah burton! Is Michelle over reacting and her threats a bunch of crap! or tell me what you would do and stuff! I dont want no rude answers either please.