Thanks for the link!
Is there audio, and does her speech match the head motion?
Is it in or out of context?
I’m severely hearing impaired, so can’t tell if there’s a match or not.
If there’s no correlation, then there’s something seriously wrong with her, and she should be disqualified for that (and MANY other) reason.
You can hear the audio on youtube.
After her bizarre head-bobbing, she seems to explain it by saying "you guys have got to try the cold Chai."