If she is eating Purina EN and doing well on it, I would not change it. That is a prescription food and there is nothing in it that would make her ill unless she has an intolerance to it. I have two pups with IBD and they are on Hill's Ultra Z/D and doing very well. RX foods are great if a pup can tolerate them.
If it gets to be a problem feeding her RX foods, you could do a consult with a vet nutritionist. You can find one at:
American College of Veterinary Nutrition
Someone mentioned a specialist...if you have not been to one, I definitely recommend going. You can find one at:
American College of Veterinary Internal Medicine > Home but you will need a referral from your general vet.
There are quite a few members with pups with IBD and I am sure some will have tips for you.
Welcome to YT!
