I was very close to my work friend until she left work a year and a half ago. I text her first most of the time and it takes her ages to reply. I often meet up with another friend who I've kept in touch with and we always invite her but she never comes. But then straight after she will apologise for not coming and ask for another date to be arranged. I know she doesnt have many friends. If we don't text her, she will then creep out of the woodwork again asking to meet.
I get married soon and invited her as our other friend is also coming. She hasn't even acknowledged the invite or RSVP'd. I text her to check she'd got it and she read it but didn't reply.
How rude is that? Should I say something or just give up on her completely?