Wow, that's a truly amazing story! Have you also tried her on a whole food plant based diet? It would be less painful than bee stings! You can watch a video (or read the transcript) about WFPB here: https://nutritionfacts.org/video/why-do-plant-based-diets-help-rheumatoid-arthritis/. Not only has WFPB been scientifically shown to prevent/improve rheumatoid arthritis, but also many other chronic diseases like cancer, diabetes, and heart disease.
she doesn't eat alot of meat, but we haven't went full blown whole foods, although 90% of the food we eat gets harvested locally either by me or a local farmer.
You might try cutting out eggs and dairy for 3-6 months and see what that does :)