My Wife Is 59 Y.o. With Pain In Her Upper

My wife is 59 y.o. with pain in her upper left quad under her breast, made worse when breathing. Saw a gastroenterologist last week and wanted her to try low FODMAP diet. Pain is post postprandial about 2-3 hours. Not relieved positionally. Quit smoking 3 months ago. Only signigicant history is fatty liver. Pain was not elucidated when exercising. Bloating and gas with sharp pain.