@sandyjr, I am confused about your question about intermittent diet and reference to your oncologist. Primary Sclerosing Cholangitis is managed by a liver specialist or a Gastroenterologist.

Here is some diet/nutrition information specific to PSC.
Primary Sclerosing Cholangitis (PSC) is a rare liver disease that damages the bile ducts inside and outside the liver. I want to introduce you and your daughter to 'PSC Partners Seeking a Cure'. PSC Partners Seeking a Cure is a nonprofit organization with various programs to give support to patients, caregivers, and to educate patients and the medical community about PSC. Here is what I read about diet-
"There is no specific PSC diet and most patients do not have to make any changes, except to continue to eat in a healthy, sensible way. However, many PSCers have related digestive issues, such as ulcerative colitis and other gastrointestinal problems, and need to stick to a specific diet, as advised by professionals."
https://pscpartners.org/about/treatment-options/nutrition.html
Another resource is NIH where you will find this information: Eating, Diet, & Nutrition for Primary Sclerosing Cholangitis - What should I eat if I have PSC?
https://www.niddk.nih.gov/health-information/liver-disease/primary-sclerosing-cholangitis/eating-diet-nutrition
@sandyjr, PSC is a rare disease, it is a progressive disease. I was transplanted in 2009 due to PSC. Throughout my entire PSC journey, my GI (Gastroenterologist) monitored my condition with routine labs and consults. Without any additional conditions, I was advised to maintain a healthy lifestyle with a heart healthy diet and to get regular exercise. He guided me and answered all of my questions.

Does your daughter have regular visits and labs with her doctor? Is she an adult or a child, for example, How active is she in maintain her own diet and health management? What has he advised about her dietary needs?