Have you tried James Wellbeloved Mark? I do agree with MM, you seem to have tried a lot of different things, and not all cats can tolerate that, so you might find that she doesn't need the mega expensive stuff, just one thing for a couple of weeks, maybe combined with natural yoghurt/probiotics. That was all Rolo needed, he can tolerate 3 kinds of dry food now, and 2 kind of wet food. He has been here 3 months though, and I didn't dare change any food for well over a month after finding somethign that didn't affect his tummy.