I don't remember who it is, but I think he's a black kitty - the name Jazz comes to mind but I'm not sure that's right - has IBD and I remember his mom saying she was feeding him plain yogurt too, along with the pumpkin if I remember right. I would try the yogurt - plain unsweetened if you can find it. Can't hurt and it might just help.

Good luck and I hope you can find out what's wrong with the little cutie.

By the way, she must be getting big by now, but there's no way we'd know that since we haven't see pics lately.