I'm not sure how much more I can take

I have a very dear friend who I've known for over 40 years. She calls round about once a month (and vice versa) for a coffee and chat - or we'll sometimes go out for lunch. It's always been a lovely ritual, but just lately she'll come round and spend the entire time talking about herself, so much so that I barely get a word in edgeways! I know she means well and she probably doesn't notice she's doing it, but once she leaves I end up feeling quite down. Has anyone else been in a similar situation?