Of course the whole thing was a setup. Simon runs the show, he had to be aware of the lady's OK voice. The show went to great lengths to set her up to be a disaster with shots of snickering and eye-raising.
She has an OK untrained voice. Both available songs show the same lack of tonal variation, basically just a flat rendition. She'll likely releas a record with a million studio tricks to make her sound better, it'll sell fairly well on her notoriety. She'll release a second one that will sell poorly and then we'll never hear from her again, mesmerised by the next "sensation" that the industry creates.
She sings a whole lot better than I ever will, still!