As I said before they have moved into emergency mode and can't get out of it. Nothing can be done in a hurry and they are going to have to talk to Heather with an SW present if necessary. Either she can live alone but supported or she can't and that needs to be clarified. If she can live with David and Ruth, where there will not be constant care, then she can live at her own home with support and may prefer to do so. If, as seems to be the case, she needs to go into a home permanently then they need to make the case for her staying in Prudhoe or moving closer to them. She does not want to go into a home, or leave her own home, so they have a lot of talking to do and needs a SW and the medical staff to help them do that.
Can the writer's please stop panicking and do this properly. Throwing Jill out of her own home is not the answer and it is a terrible thing to do.