Not sure what time you usually eat, but if she eats early tonight and then has nothing but water before leaving to pick up the car, I think your suspicions are correct.
Not gone back over whole thread, but weren't you pretty sure no A ? If so, is it possible that it would be yours ? If so, shouldn't you be party to this decision ?
Tough one to play TBH, you could address it, be completely wrong and would be a major Backslide. Need Sandi and a mod for advice here I think.