I think she would be treading on thin ice if she sang Free. I'm not sure how much of a 'singer's song' it is for these types of competitions, would Christina 'iron out' the song, try not to sing it like Haley? It's what Haley's voice does within the song that makes it.
Another of Haley's unreleased songs would be ideal simply because it wouldn't have as strong an attachment to Haley as Free or Undone. Besides they already have a working relationship with GYT
BTW, did I miss that Haley has a company called "Peachy Keen"(sp)?
Maybe I heard it wrong, but it came up in conversation about "The Company She Keeps" as a company owned(?) by Haley and for some reason, I don't remember ever knowing if that was true or ever discussed?
*(conversation was regarding Haley, not with her
)