She was on the Norwegian teams that hosted Union of European Football Associations Women"s Euro 1997 and then finished fourth at the 1999 Fédération internationale de football association Women"s World Cup in the United States. At the end of 2009 Knudsen was appointed chief trainer for LSK Kvinner FK football club
As a player, Knudsen was a midfielder who won 87 caps for the Norway women"s national football team between 1996 and 2003. Knudsen won the Toppserien league with her club Asker in 1998 and 1999. Knudsen was with the Norway team that won Gold at the 2000 Summer Olympics in Sydney. She played as a substitute in the semifinal and was one of the starting eleven in Norway"s 3–2 final win over the United States, being substituted after 90 minutes, before the start of extra time.
