My partner's sister is visiting next weekend and I'm really dreading it. She is 25 years old and lives at home, pays nominal board, and seems to have a constant stream of new clothes. I've tried hard to get to know her but unfortunately, her responses are usually one-word answers or glares - this is not unusual, she speaks to the rest of the family like this but I've observed her being fairly chatty with friends. The family in general are quite concerned that she's shy and not getting out there and being sociable enough - hence them being happy to bankroll her.
We live in a very small flat with a bedroom, living room / kitchen and bathroom. Guests sleep on an airbed in the living room. She's invited herself to stay for the weekend and is taking my bf to the theatre as a birthday present, I am not invited.
I've been quite ill recently and unable to work so my bf has had to bankroll me. I'm also recovering from surgery to fix said issue and finally I start a new job the day after she leaves. Most of the time we're expected to pay for activities and meals when she visits. This is frustrating but of course, I can't talk at this point when my bf is currently also paying my way.
Friends are all at weddings this weekend but ignoring her or taking myself to the park seems like a hostile act that's more likely to exacerbate the situation.
Is my only option to suck this up? I'm not going to deny I'm jealous of her having an easy time of it when I had to work so hard during my 20's (I'm early 30's now). I am also really aware that I shouldn't be driving a wedge in-between my bf and her but I'm just dreading being trapped in the flat with her.