But she is 10, and there is a lot of difference mentally between 10 and 13.

Agreed, she will be totally different at 13, her voice as well as everything else will have matured.

Yep, I reckon she's five years off being anything near ready as a singer. Experience helps a lot there, but she at least has some musicianship, she's capable once she grows into her voice and irons out any remaining flaws, she'll get there if she works at it. But she is nowhere near yet.

I didn't even have to analyse Hollie when she first started singing in her audition. She was exceptionally brilliant, and she'd likely have gotten a higher place if her nerves had been okay. I don't think Hollie's full potential was shown in her appearances after her first audition - which is a damn shame. If Hollie manages to calm herself when performing, she truly will be rarely discovered talent.

Performing live in front of the whole country is always going to be different to the audition, even if that is in front of the judges and a studio audience.

Exactly. It is much more difficult for a 10 year old to handle the pressure as much as an adult.