You're in my thoughts. I want so much for your Lady to get through this trial. My hopes are with you.
Longer term, you may want to look for another vet for your pets. While his approach doesn't make him a bad vet (farm vets have to develop a very pragmatic attitude about their patients), it may color his perception of how hard to try to fix something, and that may not be in tune with your thinking.
There are realities with having animals, but they are not always the driving force. Sometimes we will fight for a friend, fur or not.
Very best wishes,