Fletcher has IBD, but not as severe as some dogs (like Beau). I did not have him scoped, my vet said, let's try treating him as if he had IBD, and see how he does. With a little (OK, a lot) of trial and error, I figured out what he could eat and what would cause problems. It seems to be different for every dog. If she is otherwise healthy, you can do this, if she has other health issues, well, that obviously complicates things.
Fletcher ended up doing best on a raw diet, but he can't eat the commercial packaged raw diets, it has to be the real deal, pieces of meat and bone . I recently started giving the girls kibble in the morning (TOTW Pacific Stream) and raw at night, and he can tolerate that about two times a week. Once you figure out what works for her, you will have to be extremely careful about everything, treats, supplements, anything that goes into her system.
Good luck!