Similar situation with a friend of mime. One of 4 sisters. 2 looked out for their mum, the other two were far away and too busy but didn't want her being moved into a care home, despite it being blindingly obvious that she was not looking after herself and the daily carers were unreliable. ie sometimes the old lady would be sitting in a soiled seat as no-one had helped her to bed or even fed her.
At last, after much protesting from mum and 2 of the sisters, they found a care-home which suited and she lived quite happily there for several months, enjoying trips out and almost daily visits, until she died earlier this year. My friend suffered agonies of guilt because of the sisters' attitude.
Last weekend, in Rutland, the first statue in Britain of the late Elizabeth II was unveiled.