Went through this with my mother in law. Very hard. I can say that for us, it was the best thing to do. She was in a place with others to interact with and had activities. We had our lives back and after a short time trusted she was taken care of better than we could. It had been a constant state of waiting for the next phone call that she had fallen again or locked herself out of the house. My wife and I both work, and even with shifted hours coverage was difficult.
My mother in law was grateful to have a life again that she felt in control of. Home had become little more than a prison. Few visitors, no ability to go anywhere, and we could only do so much. Her life was being lived between a bedroom and a chair in the kitchen. A hard thing to see when you are involved and want badly to help.
A couple of weeks after move in, we would call or stop by to visit and she didn't have time for us. Bingo was starting, or a crafting class, or some other thing.
She's now in the nursing home side, and won't be with us much longer. That said, the move gave her so much more life than we could have provided.
Hope you find the best path for her.
Jeremy