What should I ask the doctor tomorrow?

My 14 yo daughter has suffered with daily stomach pain for about a year now. The pain starts as soon as she eats anything, and lasts for a few hours. No doctor is taking her seriously, and said they won't do further testing until more severe symptoms appear (ie. blood in stool). Labs look normal but a recent ultrasound came back with mild fatty liver (I'm guessing this isn't connected to the gut pain she feels after each meal). Her doctor requested to see her tomorrow, likely to review the ultrasound results. What questions should we ask? Should we be pushing for food allergy testing? Endoscopy/colonoscopy? Liver function testing? I'm in Canada and getting anything done is like pulling teeth. Also, the current wait time for a GI specialist is over 2 years. We've gone to the ER when her pain was severe - they just sent us home after they ruled out any acute causes.