The other day my FSIL asked me if she could bring a guest to my bachelorette party. She explained that she wouldn't really know anyone there and would feel more comfortable bringing a friend. I told her that I'm not planning it (my sister and friend are) and I would have to consult with them since their plans are being made based on a head count of seven (including me). I ultimately just want to tell her no, and my sister and friend agree with me. It's my bachelorette party, and considering she has repeatedly met four of the people invited (myself, my sister, the planning friend, and another) and has once met the other two, I don't understand why she feels the need to add on someone else which will just increase the costs for everyone.
I am here, however, because there have been a lot of issues since day one between me and the in-laws. I want to make sure that my reaction isn't due to the difficulties I've had with them, and is simply because she's rude. Mind you, she went on to complain that the date and time don't work for her, and why did I plan it for day X when it should have been day Y. But that's beside the point. As long as I'm in the green with telling her no, what's the best way you could suggest letting her down? I'm hesitant to flat out say "no" because of the problems I've already had with the in-laws' demands and such. Thanks!