No more friend

I am year 9 and this new girl comes to my school and my friend knows her. The new girl (S) and I become friends but after a while she would always do little things like putting the rude finger up at me for no reason or just calling me names. She would do it like once a week or something and I just ignored it until she put the rude finger up at my best friend so I grabbed her finger and gripped it and told her to never do it again. I escaped her for a bit until the transition week. We had science together and she would always bring up philosophy and then argue. Then she would purposely irate me and just use me for work and I was stupid and fell for it. She started repeating what she used to do but then in arguments she would start she would randomly bring my crush into the mix which was pathetic. I stood up to her but then she called me a 4 year old and start saying I am an open book and threaten to ask him out for me when I told her I am not dating him. She told me that I could be physical and I got heated up and walked off. She then spread rumours that I had a crush and people were coming up to me asking if they would say she told them. On the last day of school she was walking back with me and my bestie and she started saying stuff about me that was nasty and so childish and pretending I wasn’t there.