After winning the 2010 Miss Germany and 2013 Miss Universe Germany pageants, she competed in the 2013 Miss Universe pageant but failed to make it to the Top 16.
Before competing in national and international beauty pageants, she matriculated at the University of Potsdam, eventually completing a bachelor's degree in American Studies and English. She later earned a master's degree in military studies.
She succeeded Doris Schmidts as Miss Germany and Alicia Endemann as Miss Universe Germany.
She spent her youth in Berlin, Germany.
Venezuelan model Gabriela Isler was the ultimate champion of the 2013 Miss Universe pageant in which Hagen competed.