My 10 year old is being bullied

For those of you who have been bullied as a child, what helped you get through it? For parents: what have you done to help your child through the bullying mentally? We are in contact with the school but they have not labeled it bullying yet even though it has surpassed bullying. The other girl that is bullying my daughter and others has threatened bodily harm to another girl on school grounds. She has made many horrible remarks to multiple girls, including my daughter, including gun comments, threatening to kill people, and trying to get them to use her vape (which she got from her aunt)(she’s 10). Now, this girl has turned all of my daughter’s friends against her. I’m trying my best to get this resolved with the school, and trying my best to help my daughter. She is so sensitive, and wants to be liked by everything so this is hard on her. I would love some advice on how to help her navigate this.