At the 2012 Olympics in London, Anderson earned a silver medal by placing second in the 10-kilometer marathon event, finishing four-tenths (0.40) of a second behind the winner, Éva Risztov of Hungary, over the 6.2 miles of the event. Her sister Alyssa earned a gold medal at the 2012 Olympics as a member of the winning U.S. team in the 4x200-meter freestyle relay.