Will Falconer, DVM Moderator
Hey Yuka,
What you're describing is simply chronic disease: disease that recurs, over and over again. It's beyond supplements and probably diet to fix, especially for a 12 year old, but what does work is hiring a homeopathic vet to work with her as the unique individual that she is. I tell you how to choose a qualified on in my free Apoquel Alternatives Report. If you're already a Vital Animal Pack member, you'll find it as a download here: https://my.vitalanimal.com. If you're not, it's free to sign up here: https://my.vitalanimal.com/p/vital-animal-pack/
All the best, and you'll be so happy when this is cured!