As of 2013, Maffei's best performance at the World Championships came in 2006, when she won a bronze medal as a member of the German relay team. Her best individual performance at a World Championships was in 2010, when she came 15th in the 1000 metres. She also won a bronze medal at the 2010 World Short Track Speed Skating Team Championships for Italy, and eight medals as a member of the Italian relay team at the European Championships.