So sorry for the horrible time you are going through silver lining and I wish you all the very best. And also to any other GNs who are going through a similar time.
I too have just had similar situation and reached the conclusion I no longer like this particular friend at all. we were great friends and flatmates at college nearly 50 years ago, kept in touch over the years but really only got back to seeing each other in recent years. She has been to stay with us here on an annual basis and although I recognised some aspects of her personality that I did not gel with she was great fun and we had a lot of laughs.
She has just left after a week with us which was for the most part dreadful and thankfully my best friend was also here in her holiday house down the road. There were some laughs but honestly she seemed to think we were there to address her every beck and call. she full well knows the demands of running this place but it was all me, me, me, I have never known anyone to be so egocentric. She has a fairly high position in the British legal system and has plenty of money, but seemed to have no idea how others live. I got snide remarks about being a farmer's wife as if I was some sort of peasant, no offence to peasants, despite having been an art historian and a fashion designer during my working life.
We have little disposable income as she well knows but was still intent on eating and drinking both here and in restaurants with little input financially, let alone help around the place. Didn't lift a plate despite a BBQ for 20 being put on at her request, didn't think to wash up the next day when the dishwasher broke down. I gave up asking for help as it was either not forthcoming or moaned about.
She loathes all animals and constantly moaned about our dogs and cats who are very much loved and part of our lives and this is their home - so put up or shut up. the name dropping and constant litany of materialism really got up our noses. We managed to keep our cool for a week, but she will not be asked here again, despite planning her next visit, and worse thinking of buying a second home nearby, and I would be expected to be at her beck and call for that. No way!!
My best friend was an absolute brick and helped keep us up and running! this morning we had a long conversation about how to handle a get out clause. I think her suggestion of 'I think our friendship has run its course' says it all. Also along the lines of how our lives are so very different and her attitudes to us are insupportable. Both statements being unarguable. This will be done by email when I have thought it through as a telephone conversation could provoke a slanging match which I so do not want to get into.
I will not miss her as I do not need this sort of friendship and tensions in my lovely life. Doesn't that sound smug?! But it has taken 67 years to get there so I am not rocking the boat now with a thorn in my side.
Wish me luck in the handling of this, and hope I can be dignified about it. and equally I wish luck to anyone else out there putting up with difficult friendships. Sorry - long rant but getting it out of system!