I agree it did seem odd to not air her singing after she won but there may have been many reasons for that. I don't assume to know but she was clearly in shock and perhaps she wasn't able to right away. It's a LIVE show ... so what to do?
Anyway, NBC.com has posted exclusive footage of her singing "And I am Telling You" afterwards. Judging by the footage I'd say she was probably STILL trying to compose herself. I think it's cute how her baby sister is pointing on the "and you, and you, and you" part. Think she's watched Bianca rehearse much?
Let's hope they take some of the advice some of you have posted here for next season. A lot of it is worth incorporating.