My cat 10 years old had pyometra surgery a month ago. She has no issues other than diarrhea after surgery. She is playful and active. She's been eating orijen for a long time before the surgery and not having diarrhea. But now I have a problem because of diarrhea whenever I fully transitioned her to orijen again. The vet gave me a prescription intestinal diet wet food to be mixed gradually with her orijen. When the wet food is mixed with orijen, her stool were solid and good but when It's time to a full orijen meal her stool started softening again. I tried doing it thrice already her stool became solid but when it's time to full orijen, the diarrhea is starting again. The vet suggested me to deworm her today. Her wet food diet before is fancy feast chicken and liver classic but I'm afraid to give it to her now until her diarrhea resolves. Is her orijen causing this problem? Should I switch her to different dry food. I saw Natural Balance Limited ingredient green pea and duck. Is it ok to feed this to her?