Seems to me she’d be “in good health...virtually blind and quite frail” and “without daily assistance, she could not shop for food, get to the doctor or clean her own living space” in ANY setting. No more trapped living with her daughter than she would be anywhere else. Except she’d see much less of her family, and if she had any complaints she’d be thinking very carefully before mentioning them.
While she could still walk I would hold her arm, then she needed a cane, then a walker, finally a wheelchair. But she still loved the mall and the parks in good weather. She liked to smell all the good things even if she had trouble seeing them. And she loved going to Arby's for a Beef and Cheddar. And then to the Donut Den where she could sit and feel and hear the people. Sometimes we would stay there a couple of hours.
If there had been no way for me to get her out of the house I could not have done any of those things with her. My uncle though, modified his house so she could get in and out. Stairs, much less steep ones, were out of the question so he put in a ramp.
I don't know if that is possible in this case, I suspect not which is why I made the suggestion that she should think about moving.