A 2012 Olympian, Zetlin won 10 U.S. titles from 2005-12. Her national championship victories included the 2010 all-around title; rope in 2005; hoop in 2005 and 2010; clubs in 2005 and 2006; ribbon in 2007, 2010, and 2012; and ball in 2010.
In addition to the 2012 Olympic Games, Zetlin represented the U.S. internationally as a member of five World Championships teams. She earned the all-around, ribbon, and ball gold medals at the 2012 Pacific Rim Championships. In 2011, she claimed the all-around title, along with the gold medal in ball and ribbon and the silver medal in hoop, at the 2011 Pan American Games.
In 2010, Zetlin became the first U.S. woman to advance to the World Championships all-around finals since 2003. During the 2010 Pan Am Championships, she won the all-around, rope, and ball titles, helped the USA to the team silver, and earned a bronze medal for ribbon. At the 2010 Chicago Cup, Zetlin was the silver medalist in the all-around for the second straight year, as well as won the gold medal for ribbon and the silver for rope, hoop, and ball.
She trained at Capital Rhythmics.