Four years later, she was officially selected to the women's senior national team, and eventually competed in numerous field hockey tournaments across Germany and the rest of Europe.

Bachmann made her official debut at the 2004 Summer Olympics in Athens, where she competed as a member of the German squad in the women's field hockey tournament.

Collecting a total of two triumphs, two losses, and six classification points in the group stage, Bachmann helped her squad defeat China in the semifinals through a penalty knock-out, and later, scored a goal of 2–1 to upset the daunting Dutch team for her nation's first ever gold medal in Olympic sporting history.

[6] At the 2008 Summer Olympics in Beijing, Bachmann qualified for the second time as a member of the German squad and defending champion in the women's field hockey tournament after receiving an automatic berth from the EuroHockey Nations Championships.

[6] Unlike the previous Games, she and the rest of the German squad could not capitalize on their last chance for a penalty corner at the final second, and were defeated in the semifinal match against China with a set score of 2–3.