Schoolgirl Ella, who sings her own song about the death of her grandfather Bill, penned the words when she was 13.
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The Lincolnshire contestant wows all four judges at the Manchester audition, including guest panellist Mel B.
The Spice Girls singer commented first: "Whoever, or whatever, you wrote that song about, those words, I'm sure, hit a chord with everyone.
"Your songwriting is so clever. It made me go into my own little world, and go, 'Oh my God' - I felt like that at one point, and that's hard to do as a songwriter.
"And when you sang it, you just made me believe every single word, I was right there with you. What we just witnessed was incredible, absolutely incredible."
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Louis Walsh then said: "It's hard to believe that you're only 16, that was a brilliant audition, absolutely brilliant, you're a class act."Gary Barlow gushed: "That performance was absolutely out of this world, it really was. That was really something special, thank you very much for that."
Finally, Tulisa Contostavlos stated: "There's so many good things I could sit here and say about you, I could go on and on - the list is endless, but the one thing is that you are the one person that I personally go, 'I really want to mentor, I really do'. I see something so special in you, there's just a spark, you're just a star.
The X Factor launches tonight (Saturday, August 18) from 8pm on ITV1.
