Lucy and Georgina
Lucy was tipped to win X Factor in 2012 but withdrew from the competition after an apparent illness.
The guitar-playing songwriter said: "I am gutted not to be able to continue on this journey."
Her mentor Tulisa said: "I’m so sorry to lose Lucy from the competition, I have had a brilliant time working with her and I hope I can continue to mentor her in the future," she said following the news. "I now count her as a friend as she is an amazing girl.”