Hagen is the daughter of Michele and Charlie Hagen. She was a soccer all-state selection for three years at Appleton North High School. At age 15, she was diagnosed with ovarian cancer and underwent a series of surgeries and chemotherapy. She had her last surgery on May 6, 2005.
Hagen attended the University of Wisconsin–Milwaukee and played soccer for the Milwaukee Panthers. In her freshman year she set a league and school record for number of goals. She matched that total in her second year and scored 19 in her junior year and 26 in her senior year. She was named a first team All American in her junior and senior years. Hagen's 93 career goals are good for ninth in NCAA Division I history.
Club career
Hagen played with the FC Milwaukee Nationals of the Women's Premier Soccer League while still a student in the university.
FC Bayern Munich, 2012–2013
On January 12, 2012, Hagen joined German Bundesliga side FC Bayern Munich. On January 13, 2012, Hagen was taken in the first round of the 2012 WPS Draft by the Philadelphia Independence, giving the Independence her playing rights in the United States for one year. On May 9, 2012, Hagen signed a new two-year contract to remain in Munich. On May 12, 2012, FC Bayern Munich dethroned the German Cup title holders 1. FFC Frankfurt with a 2–0 win in the 2011–12 final in Cologne and celebrated the biggest success of the club's history since winning the championship in 1976. Hagen scored the first goal by a header. During Hagen's career at Bayern Munich from January 2012 up until December 2013 she scored 38 goals in the 51 matches in which she played. That total includes 8 matches in which she scored 13 goals in the Frauen DFB Pokal, a championship tournament.
FC Kansas City, 2014–2015
On March 20, 2014, FC Kansas City announced that Hagen would join their team in June 2014 after the end of her season with Bayern Munich. That year, she started seven games in nine appearances recording four goals and one assist.
Orlando Pride, 2016
On October 26, 2015, the Orlando Pride announced they had acquired the rights to Hagen from FC Kansas City. On April 6, 2017, Orlando Pride announced that they had waived Hagen.
Houston Dash, 2017
On April 10, 2017, the Houston Dash announced that they had claimed Hagen from the league waiver wire. On February 2, 2018 Hagen announced her retirement from professional soccer. Orlando City Youth Soccer announced that Hagen would join their coaching staff in Spring 2018.
