McNamee is best known for her leading role of Sammy Rafter in the award winning and top rating television series Packed to the Rafters. Before this she also appeared in the television soap opera Home and Away as Lisa Duffy playing the love interest of real life good friend Rhys Wakefield’s character, Lucas.McNamee stars in the Prom horror comedy film The Loved Ones for which won the peoples choice award at the Toronto International Film Festival in 2009. In mid 2010 she went on to film the short film 50-50 which is based on the gang wars in Sydney, Australia during the 1920’s and 1930’s. She portrayed the lead role of the real life underworld figure/prostitute Nelly Cameron. Following this she won the role of Gwen in the film The Vow, a movie filmed in Toronto in which she portrayed Rachel McAdams’ younger sister. Jessica Lang and Sam Neil were cast as the parents. She sent a self tape for this role to the USA while filming 50 50. It was this self tape that secured her the role.