 In 2006, she played Juliet and Hero for the Royal Shakespeare Company in their Complete Works season.In 2008 Christie was cast in Sam Mendes's first Bridge Project theatre company, playing Anya in Tom Stoppard's new adaptation of "The Cherry Orchard", and Perdita in Shakespeare's "The Winter's Tale" which finished at The Old Vic in London, after a sellout run at Brooklyn Academy of Music in New York City and a world tour.Among her many television roles, she played Ellen Rooney in the 2017 BBC drama "The Replacement", for which she was nominated for a BAFTA Scotland award.