Riegelhuth was top scorer in the Norwegian league in the 2005/06 season (shared first place with Linn Jørum Sulland, both 159 goals).

[2] In January 2009, Riegelhuth signed a two-year contract with Danish club FCK Håndbold[6] where she will start playing at the end of the 2008/09 season.

She made her debut on the Norwegian national team in 2003, and has played 268 matches and scored 965 goals as of July 2015.

She was the top scorer in the 2008 European Championship and was also awarded a place in the all-star team as Best Right Wing.

After giving birth 22 December 2015, Riegelhuth Koren was back playing for Larvik against Rælingen HK on 2 March 2016.