Darwitz began skating at the age of five, and attended Eagan High School, from there she was a veteran of ten years on the US National Team. She competed in two Olympics, leading the 2002 Olympics in goal scoring and scoring the game-winning assist in the bronze-medal game in the 2006 Games. In three years of NCAA Hockey at her alma mater, Minnesota, she won back-to-back national championships, scored the championship goal in her final game with 1:08 to go versus Harvard (4-3), won the Most Outstanding Player of the NCAA Women's Ice Hockey Championship Frozen Four, was named US Women's Player of the Year, and competed in an additional three IIHF Women's World Championship.