Heyer grew up in Berlin. During her school years she lived in Denmark for a year. In 2001 she appeared in the Danish-language musical Line 1, directed by Sidsel Wagner Davidsen. From 2006 to 2010 she studied acting at the Rostock University of Music and Theater. In 2007 she played my children's game at the Rostock Volkstheater in Thomas Freyer's rampage. In 2010 she became a new member of the Dortmund theater company, which she then stayed for two years. In Dortmund she played the title role in Lessing's Miss Sara Sampson, a witch and Malcolm in Macbeth, the young woman in a blood wedding, Marie in Nora and Regine Engstrand in ghosts. She was voted best actress of the 2012 season at the Dortmund Theater. After this season, she said goodbye and returned to Berlin. However, she can be seen again as a guest actress in Dortmund in 2013.
Heyer appeared in a number of short films alongside her theater career.
In 2011 she played her first leading role in the feature film Westwind, that of the East German rower Isabel, whose twin sister falls in love with a West German during a stay in Hungary. In 2014 she played Sanna in Edward Berger's film drama Jack, which ran in the Berlinale 2014 competition. In 2015 she played in pink from Praunheim's film Hardness.
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