Your PR’s advice sounds reasonable. My twin sister suffered JRA symptoms since she was 16 (now she is 48). Maybe her case does not apply to your daughter because of her age, but it is a data point you might consider. My sister’s feet and ankles often swelled horribly and ached after standing for long periods while she worked. I found that she was typically only consuming about 1g of daily omega-3. We added more omega-3 via a flax meal composition (with blackstrap molasses and whole grain flour) until her symptoms improved. Ultimately, the benefits peaked after we adjusted her daily omega intake to about 11-12g omega-6 and ~10g omega-3. Now she can jog daily and her flare-ups are minimal. Good luck.
--Adam