In 2011, the first season of The X Factor USA began. In 2012, Ally auditioned for the show. Ally said that auditioning for The X Factor was the one of the hardest decisions of her life.
On May 24th, Ally auditioned for the judges Simon Cowell, Demi Lovato, Britney Spears and LA Reid. She sang On My Knees by Jaci Velasquez and she recieved 4 yeses from the judges. She went through the second stage of the competition, the BootCamp #1, where she sang Somebody That I Used To Know by Gotye. She also went through, going to the BootCamp #2. She performed with Julia Bullock and they sang Knockin’ on Heaven’s Door by Bob Dylan.
After the second bootcamp, Ally joined Normani, Dinah, Camila and Lauren the group Lylas. They sang Impossible by Shontelle and I Wanna Dance With Somebody by Whitney Houston at Judges Home. They passed tothe main stage of the show: The Live Shows. The group became Fifth Harmony. The girls finished the show in third.