You’ll probably recognize the student in this video; she’s one of the truly great entertainers. (And watch to the end for a hilarious impression of her by her young godson–priceless!)
What I might have done differently: If one of my students arrived at her lesson in an obvious state of over-stimulation, I would suggest a few minutes of Voice-Enhancing Bodywork to bring her energy to a level at which productive work is more likely. During the lesson, I would strive to emulate the kind of ease in my own body which I want to bring about for my student. When my students sing, I refrain from singing loudly along with them so that I can more effectively listen to what is going on with their vocal coordination.
Bottom line: I wouldn’t pay for the vocal pedagogy on display here. But I suppose Liza can easily afford her fees. And maybe this teacher’s approach helps Liza to cultivate the breathless yet brassy, over-the-top, quasi-hysterical persona so beloved by her fans. . .but at what cost to her equilibrium? (Did I just use “Liza” and “equilibrium” in the same sentence?)