If she has been spoken to like that by someone in a senior position it constitutes bullying!! If he has done/is doing it to her then the chances are others are suffering as well. She should do her best to gather evidence and construct a written log of the incidents and greivences and take it to the board of governors.
Also, if she is made to work with violent people, around whom she feels genuinely unsafe, she has grounds for a law suite in that her employers (the school, and ultimately the boar) are not taking reasonable steps to ensure her health, safety and welfare within the workplace.
I would strongly suggest she takes legal advice and seeks union advice/support.
Hope it works out for her mate.
Chris (college lecturer:()