The NRA needs to get involved in this one. Considering she's in Washingtonstan she's gonna need all the money and legal help in the world.
On what grounds? The law is simple: Only law enforcement can carry weapons on school grounds. It's cut and dried, black and white. While one may be sympathetic to the teacher, the fact that she broke the law is undeniable and not debateable.
Are you a member of the NRA?