Hagen was diagnosed with ovarian cancer when she was 15 years old 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 (24).
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.
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 2012WPS Draft by the Philadelphia Independence, giving the Independence her playing rights in the United States for one year.
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
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.
On March 20,2014, FC Kansas City announced that Hagen will join their team in June 2014 after the end of her season with Bayern Munich
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