This is a much better view of her doing this, i only saw he from behind over the shoulder. I do think she had a seizure triggered off noise from all the reporterettes trying to get her attention for another question.
On the original youtube page of this incident in the very very post or right about the very first post is a link to this alternate view of it where you can see her face.
I’ve had experience with canine seizures before, and those lead me to believe that this is not a seizure, but I do suspect that it is some other medically related thing. This is not normal behavior IMO.