Responding very late....... but I wonder if this woman is not simply allergic to citrus. Citrus fruits (lemon, orange, grapefruit, lime) are common allergens and also happen to be good sources of vitamin C (also called ascorbic acid). Strawberries (also sources of C) also cause reactions in some people. Does she react to sources of C like broccoli, cabbage, potatoes, bell peppers, cantaloupe, blueberries? Sanna James, M.S., R.D.