So, I started watching this and thought, "Ok, my idol has finally lost me. This is just silly."
But then, within minutes, she had me convinced that this is obviously what Tchaikovsky meant. I would describe the character as goofy. It's remarkable that no one else I can think of draws such a stark contrast between such clearly different musical ideas. She's discovered something new outside the typical tradition of performance.
When the third movement begins it makes much more sense structurally to me now as a return. Anyways... prepare yourselves.