Dd is in sixth form. There have been incidents with another new student who started with her, it started off as silliness, grabbing dds stuff for a laugh, shouting at her for silly things , called her stupid.
Proceeded to her kicking off if dd was not with her all the time, kicking off if dd spoke to other people or had lunch with anyone else, sending a nasty message to the pupil dd had spent lunch with, screaming at them in the canteen.
Kids started coming to dd to ask if she was really friends with X as X was saying she was a bitch anx calling her names and things like that. Same child had been nasty to other people in class openly so dd had no reason not to believe it.
I told her to stay away from her. Dd did start to stay out of her way and then everyone elses too because this girl followed her everywhere meaning she was further isolated.
She really struggles with friendships anyway tbh.
Eventually I gave up and emailed the form tutor this morning , dd didn't want me to name names but just gave a brief list of what had happened and asked her to keep an eye out.
Inbetween this the other pupil on being told by someone else dd doesn't want to be her friend has cried, said they are bullies and gone to report them to staff, that the student dd was with has stole her friend and that dd had stared at her 
Dd who gets very upset at any sign of being in trouble has been hauled out of class today in front of the head in regards to this and had to sit in a room with the other pupil, the head has put two and two together in regards to my email. Dd has been told that it was just a misunderstanding (how being screamed and shouted at in the canteen because you want to talk to someone else and the other person getting a nasty message because of it and having to tell their Mum and block her is a misunderstanding I don't know.) Also told if she felt isolated it was basically because she struggles socially.
Dd has been encouraged about being friends with her and just getting on, she was open that she didn't want to be friends with someone who treated her like that. She's been physically and emotionally bullied in the past and is not interested.
Anyway they have been asked how they want to move forward.
Dd said to be civil and polite and just get on with it. The girl said for dd not to be friends with another girl...
Aibu to think this is ridiculous for sixth form and tell dd to stay as far away as possible and to tell school to sod off about making them be friends?
Aibu to have hoped all this shit was left behind before year 12!
I cannot imagine if this was the workplace 