Larsen was born in Burbank, California and grew up in Mission Viejo. She attended Mission Viejo High School where she was a four-year letterwinner on the soccer team. She was ranked a Top 50 recruit according to Soccer Buzz Magazine, was a three-time NSCAA/adidas Youth All-American, and a two-time All-CIF First-Team selection. Larsen played club soccer for the Southern California Blues.
Larsen attended UCLA and was a leading goal-scorer for the Bruins from 2006–2009. As a freshman in 2006, she appeared in 22 matches, starting 19. She ended the season tied for fifth on the team in scoring with six goals. She scored two game-winning goals in a pair of 1–0 victories over San Diego State and Long Beach State. Larsen was named to the Pac-10 All-Freshman team. During her sophomore year, she played in 23 of 24 matches, making four starts. She finished the season with 11 points including five goals and one assist. A workhorse under pressure, Larsen scored three of her five goals during the NCAA Tournament, helping the Bruins to wins over Cal State Fullerton, Oklahoma State, and Virginia. She scored the equalizer goal against Virginia in a match the Bruins eventually won 2–1 in overtime. In 2008, she appeared in all 25 matches, making 10 starts and led the team in goals with 13. She also ranked second on the team in scoring with 30 points, including five game-winning goals and four assists. During her senior year, Larsen appeared in 22 games, making 20 starts. She scored nine goals and served six assists for 24 points. She ranked third in scoring for UCLA, and scored three game-winning goals.
Playing career
Club
The WPS Years, 2010–2011
Larsen was selected during the second round of the 2009 WPS Draft by the St. Louis Athletica for the 2010 WPS season. After the Athletica folded mid-season 2010, Larsen signed with the Atlanta Beat. She made six appearances for the club with three starts playing a total of 330 minutes.
In 2013, Larsen joined Seattle Reign FC for the inaugural season of the NationalWomen's Soccer League. She made nine appearances for the club, including four starts, tallying 344 minutes as a forward on the squad. She served the assist on a goal scored by Lindsay Taylor during a home match against the Washington Spirit on May 16, 2013.
