She was captain of Iceland's national team from 2007 to 2013 and competed at the 2009 and 2013 editions of the UEFA Women's Championship.

During her time in Norway playing for Kolbotn, she finished her medical studies and became a practising physician.

[2] In May 1994, Katrín made her senior Iceland debut in a 4–1 friendly win over Scotland.

[3] At UEFA Women's Euro 2009, Katrín played in all three matches as Iceland were eliminated in the first round following defeats by France, Norway and Germany.

National team coach Siggi Eyjólfsson selected Katrín in the Iceland squad for UEFA Women's Euro 2013,[4] where she played in the three group matches and the 4–0 quarter-final defeat to hosts Sweden.