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On reflection, I'd confront her, but not her Mom. I'd let her know that she betrayed your trust, and also that it was very uncool not to make sure that everything was as you left it. I'd tell her than you got a cleaning service, then ask her how much she thinks you should still pay her, and pay her that, if it is anything. At 17, IMO she doesn't really need her mother to understand what happened, or to make better decisions in the future.