Here is my letter to her, cc to the principal and the superintendant:
Dear Ms Idiot:
I have asked you several times not to give any food to my severely allergic son, blank-blank, that I have not prepared for him myself. There are several common ingredients that could make him seriously ill or even CAUSE HIS DEATH, as has already been made clear to you and to the principal. Again you risked my son's life for your own convenience. How dare you disregard the welfare of any child in your care.
I want to make it very clear to you that should this happen again, I will be pressing charges against you for child endangerment. Should my son become ill or worse at your hands, I assure you that I will do everything in my power to have you prosecuted to the fullest extent of the law.
Meanwhile, I will be requesting in writing that you be dismissed from your position in this school district.
VERY Sincerely,
Your Worst Nightmare.
I would send this via registered mail and send copies to everyone up the line from this ridiculous idiot. Hmmm....maybe the State's Attorney should get a copy. That always gets attention. Ask me how I know.