She should certainly have a breath test for Helycobacter pylori bacteria, which may be the cause of gastritis.
If the polyp in the gallbladder (was it sure in gb?) is smaller than 1 cm, it's probably not problematic, but bigger polyps may develop into a cancer, so this issue has to cleared.
Gastritis and gallbladder inflammation are one of the most common causes of nausea. Right upper abdominal pain (under the right rib cage), cramping in nature and after the fatty meal, would speak for gallbladder disease. HIDA scan may show gallbladder function.
Try that H.pylori test first.
Meat, milk, eggs, beans...any high protein-containing food may worsen nausea, since proteins need to stay in the stomach for several hours in order to be digested. Acidic foods (fruits, vinegar, also vit C, aspirin...) may also irritate the stomach.
H pylori antibodies were detected in one of her blood tests, but it wasn't present in the biopsy the MD did while she was in for thr EGD.
Also the polyp was only near the gall bladder.
One puzzling event occured last weekend when we were late eating dinner on Friday and didn't eat until around 8:pm We ate barbecue pork, french fries and baked beans. She had no nausea the next morning....only one in the past week.
Thanks for your comments.
You mentioned "some gastritis" in the first post, and then "antibodies to H. pylori". So, two things speak for H. pylori. I can't comment negative biopsy, but I still think she should have a breath test, which I believe is most reliable.