I was bullied in 3rd grade. We were unsupervised during lunch time and I was on crutches with a broken leg. The boys kept stealing my crutches. Nobody seem to notice or care even though I protested loudly, so I hopped over to where the bully with the crutches had them, grabbed him by the hair close to the scalp, braced my wrist against his head, and pulled backwards with my knuckles. Apparently it hurt. He started yelping, but not loud enough to suit my several years of being bullied, so I kept at it until I had him on his back screaming, “Uncle”!
But that was about 50 years ago, and boys weren’t allowed to hit girls. They pretty much gave me a wide berth after that.
Twenty years ago when my twins were in fourth grade, they also had a bully, but it never happened on school grounds. It happened while they were waiting at the bus stop. They started to get stomachaches and nightmares because of dreading going to school. The school district’s solution was to have me drive them to school or babysit the bus stop myself. “It’s not OUR problem, Lady!”
I needed to work, and couldn’t go babysit the bus stop or drive them to school. Someone suggested I call the sheriff. And wonder of wonders, the boy was a sheriff’s kid. Apparently that sheriff was very unpopular around the station, so they assigned HIM to go babysit his son at the bus stop. The officer was really chuckling when I hung up. The next day, even though nobody babysat the bus stop, there were absolutely no problems, and we had no more trouble with THAT bully, anyway.
If I had a problem as asked in the question, first I’d make every effort to go through the usual chain of command. I’d also enroll my girls in a martial arts class, as well as coach them on how to de-escalate tense situations. If all else failed, I’d look into transferring them into a different school, or homeschool, and as a last resort, I’d inform the administration that I had given my child permission to defend herself if attacked, and that I would hold THEM responsible. That last communication would be notarized and sent special delivery.
If I had to, I’d hire an attorney.