If a teacher poured water on my daughter while she was sleep in her class as a form of punishment for falling asleep in her class and soaked her back

This is a parenting issue not a legal one. You should be less concerned about lawyering up to "get your child justice" over having water poured on her to wake her up falling asleep in class as opposed to addressing your childs inappropriate conduct of doing so. School classes are not nap spaces and your child should be raised to know better. It doesn't matter that she "wasn't feeling good" as that is simply an excuse for any child to do what they want OTHER than paying attention or learning in school. You child should know enough that if they "don't feel good" to seek out the school nurse or contact you in order to be brought to a physician or hospital. Now, that stated, if you feel compelled to address this with the teacher it should be nothing more than talking to the teacher about this in a rational fashion, possibly with the Principal , leaving the "activist" jargon and mindset at home. There were certainly other options such as simply sending her to the principal's office for disciplinary action. Now, does that excuse the teachers conduct, no. The key here is to ensure that the school is follows proper disciplinary rules and procedures going forward and that the teachers actions are addressed, at least internally. Thre was no harm here and your child was in the wrong to start, so this should not become a legal issue absent more, unless you feel compelled to spend a good deal of money on legal fees making a point.