lemme give you a little education about the education system. The system is set up in such a way that the bullies are not punished, but your kid is. When I was in school I used to have kids attack me all the time. Assuming we were caught fighting we'd both get suspended even if it was obvious that the other kid started it. This sucked for me because I actually wanted to learn, and was great for the reprobate that attacked me because he got a few days vacation from school. Took me awhile but I finally figured this out
The school isn't going to do anything to help your kid. If they do attempt to help your kid, they'll either botch it or it'll backfire. If the school goes up to this Donald kid and tells him to leave your kid alone, that's just the red flag. Donald will go after your kid every time he thinks he can get away with it.
The tough lesson I learned at school is that I was in a no win situation, so I had a choice: Be in a no win situation AND go home with bruises every day, or be in a no win situation without any more physical harm. In other words, I beat the holy hell out of the next jackass that attacked me, and got suspended. But it was my last time, because the kids figured out that if they wanted to get their free vacation from school from me, they were gonna have to spend a good part of it recovering from what I did to them.
What I'm saying in a roundabout way is, make sure your kid knows HOW to fight, and then tell her that she has the right to defend herself. Make sure she understands that the consequences will be severe if she starts anything, but that she doesn't have to take being attacked AT ALL.