me no understandy

Just when I think I know what's what, and that we're on the same page; she texts me asking me to join her for a party.

Why?

I don't understand. I don't think she likes me, what is she doing it for?

Maybe it's truly quantity not quality of guests.

I feel bad, cos I know life is hard right now for her. But I don't feel me accepting her invitation will make her celebration go better, more likely I'll be a downer. Huh?