Wow ya not cool to drop something like that and than expect to leave it for 2 days!
If you are at your wits end with this family and the women's ways than I agree with Playfelt ~ type up a termination letter and just be done with them ... my contract is not 'negotiable' with clients and a client trying to renegotiate the terms of it to suit them would not fly here either and if you have already 'dealt' with it and she is still TRYING to renegotiate it time to just cut the losses and say 'sorry but I cannot offer you what you are looking for ~ I need a client who can commit to paying for the full time space if that is what they are occupying' and just let her go!
Honestly this is why many of us will just not DO flex care ... you need a full time space you PAY for a full time space because they do not see it as 'special' or that you are loosing income serving them they just see that they are being expected to pay for something they do not 'need' ... but the reality is they DO need the full time space so should therefore be expected to pay for it!