Grace earned a Young Artist Award nomination in 2002 with her portrayal of 15-year-old murder victim Martha Moxley in the television movie Murder in Greenwich. She is known for playing Shannon Rutherford on the ABC television series Lost (2004–2006 2010), Kim Mills in the Taken trilogy (2008–2014), Irina in The Twilight Saga (2011–2012), and Althea Szewczyk-Przygocki in Fear the Walking Dead (2018–2021). Margaret Grace Denig is an American actress and model.