She won a silver medal at the 2002 Winter Olympics in the 4 × 7.5 km relay. She won the gold medal in the 4 x 6 km relay at the Biathlon World Championships 2004 in Oberhof, 2004. Individually, she won the bronze medal at the 15 km of the Biathlon World Championship 2005 in Hochfilzen. Grubben won the last race of the 2005-06 Biathlon World Cup in Oslo, capturing the third position in the overall rankings. She accumulated eight World Cup victories in her career. At the World Championships in Antholz-Anterselva, she collected bronze, silver and gold medals. The gold medal was secured by hitting 20 out of 20 possible targets.
On 5 August 2006, she married Norwegian national biathlon coach Roger Grubben, and adopted his last name, Grubben. In December 2007 she gave birth to their first child, a daughter.
After winning her third medal which was a bronze at the 2007 World Championships, she announced her retirement from the sport.
