Sorry, I'm aware my earlier post painted all teachers as ignorant, when obviously they're not. Apologies if I offended anyone.
So, the course I went to.
The leader gave the impression of being very inexperienced, she obviously had some knowledge of ASD and other communication difficulties, but had a very limited, stereotypical view, and came across as very smug and know-it-all.
The whole course was very, very basic and didn't appear to teach anything useful to the teachers there.
Yet they all came out with a certificate to add to their portfolios stating that they were proficient in understanding and helping children with communication difficulties and could manage tricky situations should they arise. I came out shocked that teachers are fobbed off with this dross, when the time could be far better spent actually talking to the parents, believing what they say, and putting small things into place that would help.
It's no wonder that some children can't behave in a school setting, because for a start, the courses that are put on for the teachers are useless, you could honestly learn far more by browsing the MNSN section for half an hour.
Ds's old teacher was attacked several times by dc with autism. The blame was always put on the child and/or the parents, despite the fact that the parents were desperately trying to help the teachers to understand how their child presented, not every child with ASD, but that individual child, with individual needs. But no-one listened.
These were children quite capable of being in mainstream school, however, being forced to sit still and give eye contact to the teacher to show they were listening smartly, being told off and punished when they were getting overwhelmed, being allowed to opt out of things too stressful, but having that replaced with something else more stressful to the child, being constantly pushed and goaded by a teacher who didn't believe in middle class behavioural issues, having time out that meant sitting silently, no stimulation at all (this might work for some dc, but in ds's case, although he saved it all for home, he needs to be distracted, fiddle, look at a book, do something physical - sitting silently will escalate his mood and guarantee a meltdown by the time he gets home), all these added to the child's distress day in day out, even though the parents tried to help the teacher (don't make him look at you, it's too overwhelming for him, things like that) and resulted in the child having a meltdown.
No children were ever at risk at ds's school, because the anger and frustration were directed at the teachers and TAs, that didn't stop the playground buzzing with gossip about those children though.
OP, I'm sorry your dd is scared, but it sounds like the boy needs far more support and more understanding from the teachers, who could learn how to avoid the violence.