Bartusiak made her debut in the German national team in a friendly against the Netherlands in April 2007. She was part of Germany's winning team at the 2007 FIFA Women's World Cup, appearing in one match, the opening game against Argentina. Bartusiak has since been called up for all major tournaments for Germany. She again was a reserve player at the 2008 Summer Olympics, where she won a bronze medal. At the 2009 European Championship, Bartusiak became a regular starter for Germany, winning her first European title. She has been called up for Germany's 2011 FIFA Women's World Cup squad.