My son does not know what to think anymore. This cat has been very puzzling.

He says she is doing fine--actually getting FAT, since the kidney formula is high in fat to replace some of the protein. He is only feeding dry right now.
I've encouraged him to start making some chicken food for them since he
likes to cook. But so far he hasn't tried that.

Aimee has such complex issues, it would be impossible to link the food to her
kidney situation. I use this as an example of how hard it would be for some people to prove. (when his own vets have had trouble diagnosing her even).

It appears that the most straightforward presentations would be the easiest.
That is an animal who had just had a check up...and then suddenly becomes ill.

I am really sad to read that you are going thru all of this. It is very stressful.