Anthamatten has also appeared for Switzerland at three IIHF Women's World Championships. Her first appearance came in 2011 IIHF Women's World Championship, where she allowed six goals in 25 minutes of playing time. She also played at the 2012 IIHF Women's World Championship, and once at the 2013 IIHF Women's World Championship. Her best performance came in 2012, when she played in 2 games, with a GAA of 3.38. She served as the backup in the medal round of the 2012 tournament, winning a bronze medal behind Florence Schelling