Knutsen Mienna competed with Norway in the 2008 Summer Olympics in China and scored the opening goal in the group match against Japan.

In October 2008 Knutsen Mienna was one of five Røa players who announced their refusal to play for the national team under the management of Bjarne Berntsen.

[4] She was recalled by Berntsen's successor Eli Landsem and was selected for the 2011 FIFA Women's World Cup in Germany.

She is a member of the Christian sports organization Kristen Idrettskontakt (KRIK)[5] and is a medical student at the University of Oslo.

Knutsen Mienna missed Røa's entire 2013 season due to pregnancy and announced her retirement from football in January 2014.