Thanks so much for your response. She is 65 (hardly old! And my mum is much older, but still working, very active, lots of friends, involved with grandkids etc).
FIL left because he found her increasinly difficult. I don't know the whole story, although we are still in contact. The family is very British reserved, stiff upper lip etc. They had lived apart for some time because of his work committments.
There is no discussion, debate, communication. If challenged she just ignores you. I think this is what drives me so mad- having someone in your midst who does not listen, interact, discuss, debate etc. There is definitely no full conversation and she will always interrupt and doesn't listen to answers so you cannot hold a conversation with her.
Yes, I've read about hoarding and I know it is probably all part of the same package. If you raise any of these issues she either ignores you or laughs it off. To be honest, I barely speak to her because I find it so infuriating and also because it is so one sided.
I feel for my DH but not sure if we just grin and bear it or try to make changes. I know DD (who is 2 1/2) will find it difficult too but at the moment she is too young to let it worry her. But MIL is terribly hovering with DD and everything is a potential danger. DD will soon get frustrated by this. Also, she won't play with DD on her level- just wants her to come to her and do what she wants.
I just wish I could cope with it and get through it, but I find it SO annoying and odd.
Thanks again for listening!