Just give her her job back and forget about it.
Sorry, Vicomte. If one of my middle school kids came home and told me about this, I would be on the phone to the local school board pronto!
And, if they didn't take action, my lawyer would be following up immediately.
The middle school kids do not need any encouragement. If they "imitated" the bus driver by flipping the bird to one of their teachers or the school principal, what do you think the consequences would be?
Just give her her job back and forget about it.
why?