I think someone needs to take responsibility and not keep running scared of a 96 year old who’s nearly blind and deaf.
She’s incredibly vulnerable on her own there - she could fall and die. What if there was a fire or she was burgled?
Just because she has a strong will doesn’t mean she is making good decisions for herself.
First of all you must get PoA organised for her - it takes a while. (12 weeks)
Secondly you all need to man up and organise for her to go into a home. Be prepared to tough but compassionate conversations.
I’ve done all this with an elderly relative. They were adamant they didn’t want to go into home, they wanted to stay in their house as long as possible. But we all finally told them that it was time to go into a home. We repeated it kindly, calmly, and we organised it all ourselves.
As soon as they were in the home they were so much happier. No anxiety, no loneliness, people around all the time, help with bathing, meals etc. I wish we had done it years earlier.
So much of the resistance is simply fear and if you choose the right place - that’s nice, comfortable and friendly - she will be ok.
If her house is worth 700k that would pay for 10 years in care. It also means that adult social care is not relevant because she can afford to pay for her own care.