it seems that my daughter's flares come with the change of season and last until the late spring
Oh yes. Allergies, not just weather, can be a factor. So I got tested for allergies. It turned out that I didn't have any allergies to the plants in my area.
Although I would love to move to a warmer climate, I can't. So I make sure to keep warmer during the change in seasons. My boyfriend got me a heated mattress cover for our bed (it has dual controls). And I wear more layers.