She made her Olympic debut at the 2008 Summer Games in Beijing, but did not make the women's steeplechase final. She came eleventh at the 2009 European Cross Country Championships which was held in her home city of Dublin. Britton was also eleventh in the steeplechase final at the 2010 European Athletics Championships. She just missed out on a medal at the 2010 European Cross Country Championships, finishing with the same time as bronze medallist Ana Dulce Félix. She took second place at the Lotto Cross Cup Brussels a week later.