To answer your questions:
(a) yes, she *cornered* him backstage, hugged him, and then proceeded to whisper in his ear. His only response was (according to Amy) “Uh-huh” as in indicating he is actively listening to her.
(b) I’m not sure if he really DOES know her enough to remember her. I’d LOVE to know what she actually said to him. Sounds like a set-up to me, personally. “He can’t say he didn’t know me because I just met with him a week ago.” She also said that they had met years ago with her boyfriend in tow at a party. She may have looked familiar to him without being able to place the who, what, where and when from 15 years ago! I’m sure he’s had a LOT of people coming up to him saying - remember when we met X number of years ago? He obviously wasn’t expecting her to attack him, which is why I’m saying it sounds like a set-up.
“Sounds like a set-up to me, personally.”
I’ve read or heard that she was recording their meeting at the Tea Party. Definitely a setup.