I find it odd that your DD's friends are texting you. Are you a little too invested in your DD's life, perhaps?
Invested in, if you call being involved in her life by the fact that I know about 80% of her friends by name and who their parents are. That it's our house the kids want to come hang out at. That I have - between all of DD's and DS's friends, band mates, and dance studio kids - all calling me mom, then ya I'm invested.
The kids all have my cell number, as DD has very limited texting on her phone, so when the kids want to text, they know they have to call my number.
You refer to the "lunch room warden," admit you have a temper and gave an example of your DD's temper. It sounds like you have a bad temper & your DD has one, too. Referring to the lunch aide as a warden is a little immature, IMO.
Sorry if calling them people who are in the lunch room, hallways, and common area's wardens, seems immature to you. It's what the schools themselves all them. We have hall wardens, bus wardens, sports wardens, and the lunch wardens. It is what it is. I didn't pick it, the principle did.
Your DD was enticed but she took the bait. They all behaved badly.
And who moves with a week notice? That's odd, too.
Apparently the mom has known for a couple of weeks now, that she and the boys were moving back to LA, but she knew it wasn't going to go over well with the 2 oldest boys, so she kept it to herself, until last weekend. No, I don't think she handled that very well, but it was her decision to withhold the info from her kids. Both of the boys had been making plans with friends for Halloween parties and going to see PA3, but all of that is scrapped now, that they are leaving. The boys have some hurt feelings, which would have been avoided, if mom had told them weeks ago about the move.