Back in 2015 Haughey qualified for the Summer Olympics in Rio de Janeiro as the first Hongkonger to get an A-cut in Olympic qualification, and was selected to represent Hong Kong in the women's 200 metre freestyle and 200 metre individual medley. Haughey won heat #3 in the 200 metre freestyle at the Olympics. She finished in sixth place in semifinal 2 and did not advance to the finals, finishing 13th, which was the best ever result of Hong Kong swimmers at Olympics.