As a junior curler, Peterson won three United States Junior Curling Championships, qualifying her to play in the 2009, 2010 and 2011 World Junior Curling Championships. At the 2009 World Junior Curling Championships, Peterson played second for the Alexandra Carlson team and finished in 5th place. The next season, Peterson remained on the Carlson rink, and at the 2010 World Junior Curling Championships, the team won the bronze medal for the United States. The next year, Peterson joined the Wisconsin-based Rebecca Hamilton team at third. At the 2011 World Junior Curling Championships, the team finished in 5th. In 2012, they finished in third place at the U.S. Junior Championships.