After discovering acting and singing, she auditioned for and joined the Glasgow Academy Musical Theatre Arts (now GPRO), graduating in 2009.
[3] McCann reportedly first appeared on television in the 2000s CBBC series Against All Odds as Melissa and the BBC Scotland soap opera River City as Mia.
McCann originated the role of Kylah in Our Ladies of Perpetual Succour, a stage adaptation of Alan Warner's novel The Sopranos in the play's 2015 Edinburgh Fringe Festival premiere.
[7] In 2021, McCann appeared in the world premiere of Fantastically Great Women Who Changed the World at MAST Mayflower Studios in Southampton, as well as productions at the Royal Court[8] and Almeida Theatre, and played Heather McNamara in the West End revival of Heathers: The Musical at the Theatre Royal Haymarket.
In February 2025, it was announced she'd star as Daisy Buchanan opposite Jamie Muscato in the European premiere of The Great Gatsby at the London Coliseum.