Well, if she lied or made up that story, she was really good in my opinion. During whole presentation she seemed to me as nervous and maybe a bit uncomfortable about something. The moment with student seems to be very emotional for her.
Anyway, the advices she gave about power posing before stressfull situation are very good. Few weeks ago I was supposed to give presentation at the conference, but I was told so evening before the conference took place. I barelly finished my powerpoint presentation and I was supposed to speak in front of the plenary session. Of course, I was pretty nervous. So I stood up and took some power poses while my collegue was finishing the speach and it helped me to releave the stress.