We took the keys from Mom so she couldn't drive any more, after she started falling. Her strength and mobility are limited. She uses a walker all the time. We were afraid for the safety of herself and others. (She is 92.) She is angry about losing her independence, and still hopes that she will be able to drive again. We have hired caregivers in the morning and afternoon to take her to the places she wants to go, so she can get out of the house. (She lives alone.) She still brings up the subject almost every time I talk with her (we took the keys away six months ago). I think it's time to tell her that she is not going to drive again, and we need to sell the car. Any advice?