 She competed at five World Cross Country Championships between 2005 and 2011, with her best result being 15th in Mombasa in 2007.She finished in the top ten at the European Cross Country Championships in 2008 (8th) and 2010 (7th), an event at which she has also won four team medals.Archer earned selection in the 3000 metres steeplechase for the 2008 Olympic Games in Beijing, but was unable to compete due to a stress fracture to her ankle.