My almost 1 year old has been congested for the last 9 months. After finally convincing the ped that it wasn't just a cold, she referred us to an allergist. He tested for the common allergies (eggs, wheat, milk, dust, dog, etc.) all which came back negative so he treated him with antibiotics for a recurring sinus infection (he was also in the hospital for a week in january with RSV so he thought it was sinus). After 2 months of that, he referred us to an ENT who took an xray of his adenoids and found that those were the culprit. i know you said those were fine in your daughter but that was the issue for us...we're waiting for a re-check later this month to have them removed. but long story short, he started gettine wierd reactions at day care so we thought he was allergic to something else there and the allergist tested him for some more stuff including retesting for eggs...turns out he popped allergic to eggs! so what i'm getting at is at her age, sometimes they will test negative for some things but can all of a sudden be positive very quickly. If she is tested and they turn out negative, don't be afraid to retest in a few months.