Hi Daisy-
Sorry to hear about your dogs diagnosis. I think the best thing you can do regarding extras in her diet is consult the diagnosing vet. This will give you a straight forward answer from the person who knows your dogs history and condition best. With such a serious disease looking for help on the internet is ill advised since each situation is so individual to the dog and most blogs on the topic are written by people with no training in veterinary medicine.
I’m sure your vet would be happy to answer questions over the phone regarding diet.
Best of luck!
