Really can't add anything to what has been said already. I would rely quite heavily on my vet's own opinion. As an animal lover, I would be prepared to spend any money I had to help them, but on the other hand, I wouldn't do anything to keep an animal alive if I thought they would have no quality of life. You love Bassett and are seeing her every day. You will make the best decision for her. We are all here for you.
Praying for you both.