Hewson's parents did not want her to be a performer. However she was in a short movie in 2005 with her sister. This was Erica Dunton's short movie, "Lost and Found".‪‬ her first feature-length movie was in 2008, in Dunton's "The 27 Club". The same year Hewson took part in an acting programme at the New York Film Academy. In 2010 she was in a music video and short movie for Irish band The Script's song "For the First Time".