Can't say too much as don't want to out myself but one of my friends and I were discussing holiday plans and without being invited she has now told me she has booked the same holiday on the same dates. The children get on well and I'd invite her for a coffee but we're not bosom pals and anyway i think the point of a family holiday is to spend quality time with your own family. She gave no indication she was going to do this just presented it as a fait accompli.