She was nominated for Laurence Olivier and WhatsOnStage Awards for her role as Anna in the West End production of Frozen.
She also appeared in The Life and Sort of Death of Eric Argyle at the Pleasance Dome in Edinburgh and Anglo: The Musical at the Olympia Theatre.
McKeon then relocated to London when she was cast as Natalie in The Commitments at the Palace Theatre, originating the role and marking her West End debut in 2013.
She took over the role of Cynthia Weil in Beautiful: The Carole King Musical for its final ten weeks at the Aldwych Theatre in 2017.
In 2019, McKeon was cast as Princess Anna opposite Samantha Barks as Elsa in the West End run of the stage adaptation of Disney's Frozen.