My guess is she regularly gets gastritis because she's coeliac and isn't very strict with the diet. My sister is coeliac and wouldn't eat out at even half the places Jes does. Loads of places do "gluten free" food but on the small print say they can't guarantee no cross contamination, and when you ask about the kitchen in these small country pubs, they use the same fryers and work surfaces for all meals. Which should be an absolute no for anyone with coeliac disease.
Some places use a separate fryer for anything with batter etc. And use one corner of the kitchen to prepare GF meals to reduce risk of CC. But they are verrrrryyyyyy few and far between.