I didn't think she was that good. But she definitely has the funky chicken moves like Jagger down pat.
But "contestants" like this girl are why I don't like that show. It's clearly a set up, with some little mousy type and them encouraging her/him - "don't be shy, sweetie" - then the singer belts out this song and it's obvious they're either a professional or have at least been performing for a very long time, and the judges act all astounded! Who'd have believed it!!!
The first time I saw them do that, I thought it was cool. After the dozenth time it became obvious they were fakes.