I wonder if people have tried telling her about her attitude problem? I'm hoping that no one has and she can eventually change it once it's pointed out. But if people had told her and she just didn't want to change, then she should have an idea on why people don't invite her to those kinds of things. If she wants to improve her relations with others, she should try to change, and not expect them to do so.
Yes! They have many times.
I think that like many, she assumes people should accept her no matter how she behaves, and they do. But, this doesn't mean they want her around to ruin the atmosphere.
Ah, well, her saying she has been trying to get into one of the crayfish parties for 20 years is silly then. Clearly she's not trying enough.