There was no expectations. I put no pressure on her at all. I never asked her to go to any place that interested me before, but I always go to all the places she wants to go. I was stupid to even ask her, we don't even have similar interests. She likes radio and MTV music, and the music is nothing at all like that. A text saying she can't go would be perfectly fine.
I can relate somewhat. The only reason I would skirt an invite like she is doing is if I feel the expectations of the other person are too high and I freak out due to the pressure. I would just ask her straight up if she wants to go or not and tell her what you told us. I agree with you that sometimes we need to make sacrifices for our friends and do things for them that we do not always enjoy. At the same time, I think it would have been different if she had simply told you that she did not want to go in the first place. I would never want someone to come to an event with me because they felt guilty or like they owed me.