Her highest achievement was a bronze medal at the 2002 IAAF World Cup. She represented her country at the 2001 World Championships in Athletics and also at the 2002 European Athletics Championships. Friedrich was a seven-time national champion, with five straight wins at the German Athletics Championships from 2000 to 2004 and two indoor titles. At the junior level, she was the 800 m silver medallist at the 1996 World Junior Championships in Athletics.