If you'll google her and look at the interview I watched on CBS for their morning news magazine, you'll see someone who is less comfortable being interviewed and maintaining eye contact (with interviewer or camera) than she is comfortable singing on stage.

I think that bump and grind was aimed at the audience, not the judges, because I think she was already hearing the grumbling and gave them back something to consider. She's more than just her age, more than just her looks.

They're talking about her right now on Diane Rehm. :)

SRS