At the 2002 World Cup in Zurich, Kozlova won her first international medal as an American, winning bronze in the team competition. For the 2003 World Aquatics Championships in Barcelona Kozlova participated in three events. With new partner Alison Bartosik, she placed fourth in the duet competition. It was in Barcelona that Kozlova won her first world championship medals with a silver medal in the free combination team event, and a bronze medal in the team technical competition. For the 2003 Pan American Games Kozlova won two gold medals; with Bartosik she won the duet competition, and they both were part of the U.S. team that won the team competition.