oh I'm so sorry to hear that and for your loss, I can imagine how difficult it must be on you..people can truly be so terrible and high school is a time where a lot of people seem to be set on throwing away any common sense, respect, and basic empathy. they are the truly pitiful ones in the end, and I have experienced seeing something similar though the person involved was fortunate enough to pull out of school completely, though she was unable to ever enroll in a school again due to the trauma and is still in the healing process many years later. it's heartbreaking how mean people can turn and blind eye people in positions of authority who should be managing the situation choose to give.
I hope you will focus on taking care of yourself and making sure you're okay each day, you might not be able to get away from these awful people right now but one day it will all be behind you. if you need to talk about anything my dms are always open, take care