She received a silver medal in the individual event at the World Games in 2005. She also competed in the mixed relay, where Germany finished 6th. Schmalfeld had the fourth and last leg, and advanced the German team from 11th to 6th position.
She has competed in eight World Orienteering Championships, between 1995 and 2009. Her best results were 9th in the short distance in 2001, 9th in the long distance in 2003, and 5th in the relay in 1995 with the German team.