With respect to the original incident, the school had no control over either student after they left the bus and walked two blocks. (In cases where a students leaves a bus, walks a couple of blocks, and is killed in a pedestrian accident, schools always claim they have no jurisdiction or liability.) In view of this, the school lacked jurisdiction or authority for suspending your child--particularly when there wasn't any notice of this action. The VP's failure to supervise during the earthquake drill was negligent. The girl who was beaten up during the drill has a cause of action against your daughter and the VP. If there are documented incidents of bullying by this student, especially if the school was on notice, then this may be actionable under a theory of negligence. Your daughter's stipulated expulsion is likely not actionable since you stipulated to it, and you didn't mention any due process violatons.