Zimmermann starts for the Rostock Rowing Club of 1885. She was 1997 and 1998 Junior World Champion with the eighth. In the next few years, she won in the U23 class medals in the coxless four. In 2002 they rose in the German Roller and won bronze medal in her first adult class. 2003 succeeded the German eighth at the World Championships in Milan winning the title. A year later the aft finished only fifth place in the Olympics. 2006 Carpenter appeared with Elke Hipler except in the aft in the coxless pairs at. At the World Championships in Eton, the two won bronze in the two- and silver with the eighth. 2007 could Hipler and Zimmermann at the World Championships in Munich in two even win silver, but occupied with the aft only fifth place.