I totally agree with others. She wants her spot she truly does so she isn't lying but if something better comes along that fits her needs she will book that spot instead- leaving you high and dry. She will inform you but she won't until she has actually confirmed something somewhere else.

This is why you need to take a deposit to hold the spot. Money talks and if she was required to give you money she would have been more serious about it. You are setting yourself up for more families to do this to you. Those of us who take deposits still run into this issue but it doesn't put us out a bunch of money if the give a deposit. That deposit buys us time to find another family.