Nobody has sung it better. She could sell that as a single right now and it would top the charts. Remember she is only 14yrs old.
It is a great song. She sang it beautifully 
Is she really 14?
Yes.
One of the best voices I have heard at least for that song anyway.
Listen to her here. Now remember she made this her own version.
If she don't win it, it probably will be because the judges think she may be too young to do all this.
There's only 1 other girl that may be beat her to win it all and that is Melanie.
Compared to the other 14yr old, she really looks much, much older. Wait until she's only 40. ;)
Love her Sarah-like voice. I think she will win it all but even if she doesn't win, this will be her future for sure.