My DD was queuing up for lunch today, she was upset and crying because her friend was being unkind. There has been a few friendship issues recently 
The teacher asked DD what was wrong, and asked her to go to the quiet room with her to talk about it. DD said she didn't want to talk about it - this is because she doesn't trust the teachers any more, she says if she goes to them for help she just ends up in trouble. She tried to walk away, so the teacher said "don't walk away from me young lady", grabbed her arm and pulled her, accidentally knocking her to the floor.
Is this acceptable, especially given she wasn't been naughty, she was just upset? For background she is 7 and has suspected ASD.