I can hear the noise...it sure doesn't seem to slow her down, does it? I wouldn't guess what it might be and pro'ly wouldn't hurt to have it checked out.
When mine 'reverse sneeze'...Brody's only done it 3 times but Mia does it at least once or twice a week, it seems...they stop whatever they're doing and come to me to help them stop it, especially Mia. They do seem to only 'reverse sneeze' when excited and hopping and popping, but your vet would be a better guesser than me.
One thing's for certain, though. She's a absolute cutie pie bundle of hyperactive joy! What I couldn't do if I had all that energy...!!!