Henderson succeeded in gaining a scholarship and boarded at the school from the age of 11 to 16.
She attended the school at the same time as Dan Ferrari-Lane of boy band District3, who was on The X Factor with Henderson in 2012.
During the show and following her exit, a number of celebrities came out in support and praise of Henderson, including Adele, Chloë Grace Moretz, Simon Cowell, Sarah Millican, Stephen Fry, Lily Allen, Nick Grimshaw and Cher.
During January and February 2013, Henderson took part in The X Factor live tour, where she sang four songs: her X Factor audition song "Missed", "Believe", "Rule the World" and "You Got the Love".
On 23 January 2013, she performed "Believe" at the 18th National Television Awards.
Henderson's first single, "Ghost", co-written with Ryan Tedder, was released on 8 June 2014 and gave Henderson her first number one song on the UK Singles Chart while remaining in the top five of the chart for eight consecutive weeks.
Henderson began singing around the age of three and taught herself to play the piano a few years later.
She began to put on shows for her family at Christmas and developed a special bond with her grandfather Bill, who encouraged her to pursue her love of music and songwriting.Her interest developed further at primary school, St Martin's Preparatory School in Grimsby, and she subsequently decided to audition for a scholarship place at Tring Park School for the Performing Arts in Hertfordshire.Henderson and James Arthur were in the bottom two in week 7 and sang for survival, after which the judges were split on who should go.The decision went to "deadlock" and the public votes cast.Arthur got through after gaining 13.7% of the vote to Henderson's 12.1%.Henderson was the last female act to be eliminated as the top 5 remaining acts were all males.