What a wonderful story of love! Your love shines through with every word!
Here in North America there is something called Bull Jack. It is a calorie dense product for dogs. Maybe there is homeopathic or naturopathic vet you can take her to, that might have some ideas. Also there is a paste - I will call my friend to get the name of.
Like YorkieMom1 said you are doing such a great job with your gal. I too would have her eat anything she wants! Also another idea you might be able to get an appetite stimulant for her.
For moving again, how about having some blankets with her and your scent on it and she can stay in her crate or playpen. I would introduce her to new house slowly. Maybe the kitchen and then your bedroom, so she can slowly get used to it.
If her joints are achey how about some glucosamine and chondrotin? These are supplements for joints. See what your vet thinks.
Also one more idea - how about a heating pad put on very low under her blankie when she sleeps?
Let us know how your move goes; and we'd love to see a pic or two if you find the time
