Hannah, who works on her family farm, impressed the judges after performing Queen's 'Somebody To Love' and got a standing ovation from all four judges.
But after her audition aired, Hannah received criticism for not appearing to reveal details about her musical background in her VT.
It emerged that the 30-year-old is a trained soprano and has worked as a lead soprano with Simon Cowell's classical music group Il Divo. She also worked as a backing singer on Britain's Got Talent, and has been a vocalist in musical theatre shows.
Defending her place on the show, Hannah told The Mirror: "I am a country girl that helps on a family farm. I have never been lucky enough to have a record deal or a West End credit. I have been a back up on a smaller scale but I have never had this opportunity."
Hannah, who auditioned in front of the judges at London's Wembley Arena, also told the newspaper her audition was "petrifying but amazing."
Watch Hannah's audition below:
Viewers will next see Hannah in the Boot Camp stage.
The final auditions will air on this weekend's X Factor, kicking off on Saturday 19 September at 8pm on ITV.
Try Reveal's digital edition on iPhone & iPad. Subscribe now & never miss an issue!
X Factor's most shocking moments: