Your feedback is very helpful...thank you very much!
Also talk to your vet about giving her Omega 3 & 6 fish oil. It is great for their health and can moisten things up.
Since your dog already has a documented history of GI problems, check with your vet. It sounds like the diet change to control the diarrhea just went a little too far in the other direction. Since pumpkin has a lot of fiber, I can't imagine it would hurt anything to try it, but still check with your vet for any other supplements that might be needed.
One other thing that people sometimes forget is to check is water. Is she drinking the bowl dry and looking for more, or is she just not drinking enough at all? If fiber is going to help, without causing a tummy ache, additional water intake is essential.