In preparation for the world competition, she ran at the Almond Blossom Cross Country in March 2011 and took second place. She managed 16th place at the 2011 IAAF World Cross Country Championships in Punta Umbría. She ran a personal best of 15:31.26 minutes for the 5000 metres at the FBK Games in June then ran a steeplechase best of 9:37.60 minutes at the Adidas Grand Prix in New York. Britton represented Ireland on the track at the 2011 World Championships in Athletics, narrowly being eliminated in the first stage of the steeplechase. In November she came third at the high-level Cross de l'Acier cross country race.