| I don't know what the problem is, but a few comments. Given what you've tried, it does sound a bit stubborn, or maybe needs more time. Switching foods suddenly can cause diarrhea, but what you describe sounds a bit beyond that. The combination of switching foods and stress could be even worse. But four weeks straight of that just seems overboard. I'm glad you're trying to help and not ready to give up on her.
Trying the no-grain is a good idea, but I'd also try one protein source from an unusual meat. (i.e. rabbit or whatever.) You don't need a prescription diet and they generally aren't good quality. I wish vets would get off the prescription kick. You only need to look at the ingredients on a normal can of food, and you're capable of doing it all by yourself without the vet's help. (Doctors don't treat humans like this, but vets treat humans as though they're incapable of actually doing anything.)
The probiotics were also a good idea. Sigh.
One important note: don't fast a cat for a day or two! Cats in the wild who are eating properly for a cat should be able to handle that, but your average cat eating your average commercial cat food cannot. A sudden drop in food like that can cause liver disease. As a general rule, you don't want to let a cat go without food for more than like 24 hours. I know this is good for cleaning the system, but cats just can't fast that way, plus they don't really drink enough water naturally to do something like that correctly.
I agree to get a second opinion. You might seriously consider a holistic vet. I'm rather curious if a cat can have aloe -- a holistic vet may have an answer to that. | 
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