Sandra can you get Nutri-Cal in Canada? We use it for puppies, or sick dogs who need a lot of calories really quick. It comes in a tube and you can just squeeze it into their mouth. Your Vet might have it on hand, or a feed store may have something similar.
I cooked plain chicken breast for Ivory, and she did really well on it. Some rice, or potatos occasionally as well, as she still needed carbs, but the fresh cooked still warm chicken was for every meal. I think it being warm helped her be more interested in it.
I'm sorry this is progressing so quickly. Hugs to you, Jim and Zoe.