Rodaidh's allergies are also worse in the spring and summer as he has pollen and harvest mite allergies as well as house dust mites and food storage mites. Personally I'd have her retested to see if they can find specific triggers, environmental allergy testing is generally very accurate (unlike food allergy testing). I don't think I'd be happy about putting her on an immunosuppressant drug potentially long-term without having the most accurate diagnosis I could get, as said if her itching is being caused by something other than CAD then the Atopica won't be any use anyway and if she does have a break out and it gets infected from her licking/chewing (as Rodaidh's paws often have done) the Atopica could make this more difficult to treat as it compromises ability to fight infection.