Hi,
I think just because your kid has one more year to go in the school doesn't mean that you will tolerate everything. I suggest, call the teacher and politely talk to her and tell her that you have a few doubts and it would be great f you both can talk it talk. If the teacher cooperates and addresses your concern, well and good, else, in my opinion, you should talk to the principal and let him know what is going on, and how the teacher is least bothered in informing the parents and have no explanation for what she is doing.