If I were in your shoes hoping the thong comes out I would be prepared for it by having one she likes on hand. Additionally you might want to mention that if she goes for it early in the week she will not have to worry about the big bikini tan line when the changeover happens.
Thank you also. I guess I should try and find one or two just in case. They are very hard to find here anytime, never mind in winter. Looks like I have some work to do lol.