As a junior player, Duncalf won the European Junior Championship title. Duncalf won the European Individual Championship title in 2006 and 2007, and theBritish National Championship title in 2007 and 2009. She was also a member of the England team which won the World Team Squash Championships in 2006. In 2008, she finished runner-up at the British Open (losing in the final to Nicol David). Duncalf ends the year 2009 on a high when she won three titles in a row—the Soho Square Open, the US Open and the prestigious Qatar Classic.