B.C.
You call every day. Take names numbers and write down what they say. You let them know you are not going to forget and you are not going to let them forget either.
No kidding the teacher is sick (that works on so many levels). She needs to not be in a classroom until she's had a lot of therapy. If she's tenured they might not be able to fire her, but she could be shuffling papers in the office instead of torturing kids in a classroom.
Calling the media is not a bad idea. You can't wait on this too long or the issue will get cold, and they will try to sweep it under the rug.