She has just a remarkable voice. I wish sheโd do like 30 country albums and 30 cover albums. This live performance is substantially better than the studio version.* Like absurdly better. (Yes, I know itโs from Hannah Montana.) Sheโs improved and grown as an artist so much since then.
She has the best American voice that I know of right now and in that performance she really throws everything at it.
*Because that is a movie, sheโs lip-synching her own vocals there. She is not lip-synching in the video performance. In fact, she has a neutral non-karaoke mic with no reverb (which is rare).