I realized that being a bit out of the cultural loop (never seen Les Mis, tho' we sang a medley of tunes in chorus), I didn't have the same visceral reaction that people who'd seen & loved Les Mis would... the significance between the song's lyrics and her own self standing there would have taken me, too.
I just really, fervently hope that she's got a good support network so that she doesn't get devoured by the Forces of Celebrity.
What I think was the coolest was how professionally she sang. Once she got going, she didn't show nervousness at all. It's what the word pwned was made for

However, I think that was perhaps partly being in her own world... since she seemed surprised when the show's host told her that she'd gotten the biggest yes he'd ever given... and she had been standing right there...