Update. Friend filled out correct form with Union. Administrator quietly removed student from friend's class. Although administrator did not follow the proper procedure, all the Union was really going to be able to do was get the student out of her class, so once they hear the student has been removed, they'll drop it.
Friend is still mad as ehell, especially since this administrator is in charge of her review, but they have mostly been avoiding each other. Administrator retires this school year, so friend won't have to deal with it for longer than that.
Next time, friend shouldn't bother with the school's chain of command, since they have proved that they aren't responsive, or the union, since they were willing to expose ANOTHER teacher to a violent student. If she's assaulted again, she needs to call the cops and have the student charged, not just shuffled off to another class. And maybe the local news.
Both my girls were assaulted at different times, on school property. The school was just going to suspend the perps for 3 days. We called police and filed charges. The more violent offender was sentenced to Juvie, the other got community service and an additional punishment that fit the crime.