FSIL driving me nuts...

So FH family is really so nice for the most part but his oldest sister is one of those 'victims' - woes me, everything bad happens to me kind of people. She's been in a miserable marriage for years and they are supposed to be getting divorced so when I saw her on Easter I said something like 'I'm sorry for what you are going through - I sent the invite to your attention but if you and [her husband] are still wanting to come as a couple, please feel free to respond for two.

Then she starts talking about finding a guest to bring etc. She hasn't met anyone and we aren't inviting people with guests unless they have a significant other and I am just so annoyed by that. It's all about her. She can't just be happy being with her family and seeing her brother marry she needs a random 'guest'. Uggh. Just had to vent.