It would seem to me that she needed to let you know by Friday if she was unhappy. Is she set in her decision? Has she found someone else? I would suggest you say you reviewed the terms of your contract and she is still entitled to 2 more weeks of care or she can leave immediately and forfeit her deposit.

I would also suggest taking this out of your contract! Why screw yourself over like that? My contract states they give a 2 wk deposit that can only be applied to their last 2 wks of care if one months notice is given. That gives me a month to either juggle some finances or find another family. I don't offer a probationary period however if things are not working out at any time I offer the family their deposit back in lieu of notice but only if I can't manage the situation for the month.