There is nothing to indicate it is a physical problem.
On the note of physical issues, there is a link between giftedness, asthma and allergies. During the holidays people have many unusual foods and plants around the house. Something as simple as a new sort of christmas tree in the living room could be triggering an allergic reaction. (nut cookies from grandma, a new doll, etc., etc.)
I was not sure why you ruled out something like that so quickly...so I mention it in case you have not considered. I am no doctor here, but for something to start fairly suddenly (breathing issue) and then to occur regularly, more than once a day, I would be more prone to have her looked at for a physical cause. I do hope you figure this one out soon, it sounds a bit scary for her!
