Crossley was a pupil at Bispham High School Arts College, Bispham, Blackpool, Lancashire. She was put forward for audition in Emmerdale by Blackpool-based children's casting agency, Scream Management, and from hundreds she made it through to the final six, who were then invited to take part in a workshop. She then made the final two, took part in screen tests and was sent back to the Fylde to await the decision.
Emmerdale is not her first television appearance. In 2006 she appeared in a support role in a one off Docudrama, Becky's Story on BBC One, a special episode of the current affairs programme, Real Story hosted by Fiona Bruce. The episide she appeared in looked at how a vulnerable teenager was failed by a system supposed to protect her from a dangerous paedophile and prostitution. She had won two awards in the annual Scream Awards – and got her seen by TV director Fran Baker, one of the judges, who called her to audition for Becky's Story.
She has won dozens of awards at local music festivals. When she was nine years old, she played the part of Eva Lauren in rags-to-riches musical Her Benny at Liverpool Empire Theatre. And at eleven years old, she won the national Teeny Bopper Talent Show and competed against hundreds at festival4stars where she was crowned winner. She has studied drama at Scream Theatre school, Blackpool. Kelsey also trains her singing with top vocal coach Zoey Tyler, piano with Concert pianist Neil Oldham-Campbell and drama with Seren Mistery.
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