In the course of her career, Kummer won a World Cup race, on December 28, 2001 the giant slalom in Lienz . Her best result at the World Championships in 2001 was a fourth place in the giant slalom in St. Anton am Arlberg . In her only participation in the Olympic Games (2002 in Salt Lake City ), she was eliminated in the first run of the giant slalom.
In the 2000/01 season, Kummer won the overall ranking of the European Cup and was twice Swiss champion (1999 in slalom , 2004 in giant slalom). She resigned at the end of the 2003/04 season.