Good morning! Does anyone know the ins and outs of the diet? What exactly can't be eaten? A relative…

Good morning! Does anyone know the ins and outs of the diet? What exactly can't be eaten? A relative had surgery in June. She's now experiencing severe pain in her right upper abdomen and is in the hospital. Her abdominal ultrasound is normal, and her gastroscopy showed no ulcers, but she has a burn from reflux, which is causing the pain. The pain started on Tuesday and isn't getting any better. We don't know what to do anymore. She has pancreatitis, but they said it's not critical. How should it be treated? What with? She was generally following a diet, but no medication was prescribed.