I know you do not want to hear this, but this seems like a case of "children will be children." If you were not told what the actual criminal charge was, I seriously doubt there was one. If there was, police officer made the charge. To PRESS charges is up to the DA/Prosecutor, and it is highly unlikely any charges will made against your daughter.
Actually, the police officer was giving you some helpful legal advice. It appears by saying to keep your child indoors, that wold mean be sure that your daughter does have another "incident" while the DA/prosecutor is deciding to PRESS charges. If your daughter has not been in serious trouble, this is very likely to go away, and no official charges will be filed. This is very rare for the circumstances you presented. I also agree with you that it would be a good idea for you to move once your lease expires, and move into a much friendlier school district.
Do make sure that your daughter is not in a position to make the same mistake again. That is when I believe you will have something to worry about. Not now though, jut try to keep your daughter out of trouble, and you will see the charges dropped, if, like I said, any were ever made in the first place.
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