As a junior curler, Kjær Molnar played in three World Junior Curling Championships. She played lead for Norway at both the 2011 and 2012 World Junior Curling Championships and was the alternate for Norway at the 2013 World Junior Curling Championships. At all three events, the teams were skipped by Kristine Davanger. In 2011 and 2012, the team finished 7th and in 2013, the team finished 10th, relegating Norway to the European Junior Curling Challenge for 2014.