Poor kitty... I had read those posts, but didn't connect them to your kitty, sorry!

This is a good site for Irritable Bowel Disease... Cornell is a fantastic resource.
http://www.vet.cornell.edu/fhc/brochures/ibd.html

I hope you can find something out to help her. When my girl, Sophie, had really bad IBD, I had to change her over to California Natural. The vet suggested that because he said that the extra vitamins and minerals added to the other brands can make her system even more irritated. California Natural is supposed to be just chicken, chicken broth and rice. I use Nutro now as well, and that also works extremely well.

I hope you can find some relief for you girl. Did you try a teaching hospital? We have University of Pennsylvania in Philadelphia in my area. Not sure what is available in your area.