Another thought, maybe you should let her sue

and go to the court. The most you will pay for court fee and one week payment. At the same, you might be able to garther quite more information about her childcare. (I am not sure how much you can get. Check your small-claim court books and webs.) It may help you to file a suit against her. Check the post,
http://web.wenxuecity.com/BBSView.php?SubID=law&MsgID=63125