My first post so forgive me if I fluff any etiquette issues. I have been part of a group of friends for 3 years and we go out for dinner every month. I met them through my SIL at her hen do years ago and when we moved to the area SIL invited me to join them. It's been lovely thus far and I haven't been aware of any issues. It is tradition for the group to go away for major birthdays and this year Dubrovnik was chosen as the destination for one of the girls 50th birthday celebrations. This was mooted in Jan and I was about to go away for three months with DH and DS to Aus to see his mum but I said I'd go with the consensus re accommodation options and I' wasn't fussy. Our first dinner since we got back we talked about Dubrovnik and was asked if I still wanted to go - I said yes, very excited. I had a txt the next day from the girl arranging the travel to give me flight details to book and accommodation options - I said I didn't mind and would again go with the consensus but one villa was particularly lovely. Then another group txt came through to say there was concern over costs and to hold on. Then I got a txt from the birthday girl saying that as I was now coming it means that the accommodation they were looking at wasn't big enough and they would now need a more expensive option. She didn't think it was 'fair to ask the others to pay more and it would be best if I didn't go. Sorry xx'. This contradicts the txt from the other girl slightly and I'm not sure I've been given a straight story - I don't think the detail matters. I haven't responded but I've not heard from my SIL who I'm assuming was aware of the discussion the others had. Not sure what to do - DH is furious with SIL (they're not particularly close).