Geez. I am so sorry she and you had to go through that. I wish I had some good advice! Maybe clarify that a handoff needs to be in person-- if she is not left in your care, she must be handed off to a trusted adult.. not just left at a drop off location! But I'm not much help because I don't know how to say something so obvious without being obnoxious. I'd be livid if I were you.
