I take it you have never called police to "tresspass" somone, as they call it here.
I will give the benefit of the doubt to the police that they acted appropriately and the woman responded inappropriately, firstly, to the point that they decided to arrest her, and secondly, to the point that they tazed her for resisting arrest for 2 minutes.
Anyone can file a lawsuit for pretty much anything. She was in violation of law and/or policy and refused to remedy that appropriately when given the opportunity.
Maybe there is more to it that we don't know and we will hear more about it.
Except she wasn't. Federal law, the Americans with Disabilities Act, supercedes state law and definitely school district policies. ADA allows people to not wear masks when they, as the police admitted, have a disability.
The basis for the arrest is about as lame as arresting a blind person with a seeing eye dog because the school prohibits dogs on their property.