You’ll wanna use strategy. Tell your teachers/counselor/Principal over and over again for every single thing she does to harass you. Tell them so many times that they genuinely believe they can’t do anything to help, try to make this take around a month, tell them whenever she does something to harass you, I did the same thing with the guys who threw oranges at me, tell on her so many times that the teachers want to do something, not for you, but for themselves, because let’s be real, a lot of teachers will not care all too much about what’s going on, but this lily girl, she seems like a real thorn in your side, so you got to go about it we’ll if you want her gone, so tell whenever she does anything significant to you (negative of course) and they will want her gone because of having to constantly hear about her

Bring a shotgun to school 😉