First of all, if it is ok with you, I will add her to my prayers. Second, I can sort of relate. In the past few years my own mother has had cancer three times. Then one doctor told her she was imagining her current problems, the other was saying she has lupus and it was attacking her thyroids. Another cancer doctor told her she does not have lupus, but wants to see her anyway. When asked why, he pretty much eluded to the insurance money. She finally got to see a thyroid specialist that was recommended, after a few months thanks to a cancellation. He said it was not lupus, but a thyroid problem, she has permanent damage now, but it is treatable. She still is not up to 100%, maybe 75%. So I can relate on the sick mother issue. Thankfully I still have my father though.
Now as far as the husband goes. How well do the two get along? Do you have room for her? He could be looking at it as a change. He might have to be on his best behavior full time now, is his thinking. He might be afraid of the change itself. Do you have young children? Maybe you can sort of "sell" him on the idea of her being a full time nanny sort of speaking. Someone to help with the children. But like Ashlar has said, you need to have a talk with him, to hopefully find out what the cause of his hesitation is.
