Actually, Stella, as you were on last week about this situation, I am surprised that you haven't taken the correct action to resolve this and, in the very minimum, that you are liable for her pay, paid up the amount that you believed is owed.
If she has infringed her minding responsibilites, as per tigwig's excellent summary, I am then surprised that you have not taken the necessary reporting action.
All this thread is doing is rehashing last week as to the excellent advice you got - and the need to get the police involved if there was harrassment. Apart from action from them, there are legal restraints that can be used - if deemed necessary and appropriate in that he is not allowed within x meters or your residence and school.