Her first job was with the Oxford Stage Company playing Miranda in "The Tempest". The Italian director Roberto Faenza gave Aubrey her first film role playing opposite Jean-Hugues Anglade in "Look to the Sky", a film produced by Elda Ferri, and set during the Nazi Holocaust. Juliet won the Davide Donatelli award for Best Actress for her role as Hannah. Antony Page and Louis Marks then cast Aubrey as Dorothea in the BBC adaptation of "Middlemarch" opposite Rufus Sewell, for which she won a BAFTA for Best Actress, and the Broadcasting Press Guild for Best Actress. She then joined Haris Pasovic's Sarajevo Theatre Company. She appeared in several plays with the company, all created through the actors' improvisation. She continued to build her career as a theatre actress, appearing next in Trevor Nunn's "Summerfolk" and Katie Mitchell's "Ivanov" at The National, Tim Crouch's "An Oak Tree" for Karl James at The Soho Theatre, and "Three Sisters", "Twelfth Night" and "The Collection" all for Chris White. Michael Winterbottom then cast her opposite Robert Carlyle and James Nesbitt in the much acclaimed film "Go Now".