My poor Keeper, that's complicated, a friend you don't want to hurt but she can't realise she's stuck in the past. And i'm afraid she won't change. People i knew like that are still in their little town, seeing the same persons on the weekend, talking about those years !!! How great ........ even just two hours are too much when i'm there. I can't, i tried a few times, but it's not interesting at all. They seem to be happy all together talking about this and that again and again .......
Except telling her the truth i don't know what you could do. Just tell her next time she calls, you're not interested in this sort of meeting, you're tired of talking of the same thing again and again. Things have changed for you since this time. Maybe she will propose you to do something else, a bit different this time.
Good luck !