I wouldn't be surprised if she goes this week. She has what I call 'The Kate Bush Factor'. By that I mean that she doesn't sound like anybody else; her voice is her own and unique, immediately identifiable. That is as far as the Kate Bush comparison goes, however. She seems to be quite limited in what she can actually do and would probably (at least in my opinion) be more successful singing Folk than Pop.
I think the show has come a little too early for her and she is not quite ready. Having made it well into the live shows, though, I doubt she will get the chance again.