Has she got a wide circle of friends where she is? Would they visit?
I am sad to say that as my mum's dementure got worse many of her friends (some of them lifelong, nearly) found it all too hard to cope with & their visits tailed off. Two or three of them did carry on visiting, so she always had a couple of visits a week.
But the staff were so nice & good that I am certain she didn't miss the friends. And, sadly, after a while she didn't recognise them at all.
If she did come to a home near you, how near would it be? If it were London, say, but north when you ;live south it would still be a major effort to visit. If the home were within walking distance of your home how often do you think you would/could visit? And would want to visit?
I hope those don't sound like awful questions, but I think you should ask them of yourself before you engaged in a move. And she would have to start again with new GP etc etc.
Poor you - it's so bloody tough & soul destroying.