My Mum is like this, I've posted about her before.
I think in her case it is because she has nothing in her life apart from me and my DH.
I just came back from a 4 day work trip to an amazing city and she didn't even ask if I had a good time, she went straight to a monologue of all the boring shite that happened while I was away.
It's like a download of the minutiae of her day, the neighbours, what she watched on TV, what the dog did. He said/she said of every conversation.
Oh and the repeating, that is the worst. I can just about cope with the inane yammering but not the re-telling several times.
A MN'r on here once described this as Tales of the Expected. This is exactly what it is.
There is no dementia, she has ALWAYS been like this.
This week while I was away she pissed my husband off so much he told her that he wasn't interested and to shut up. She either didn't hear or didn't care, just carried on. He got so angry that he had to walk away.
No self awareness, can't judge situations where people are obvious glazing over , or worse trying to edge away. Just keeps on and on.
I have an interesting and very varied job that most people can't wait to grill me about. She never asks how my day has been. So I don't talk about it now.
She makes drama where there is none and everything is a catastrophe. It's exhausting.
I do love my Mum, she can be generous and kind but I just wish she would STFU.