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 taking place 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, adopting 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.