Boxx missed most of 2006, first for surgery to repair torn cartilage in her right hip, and then for torn medial collateral ligaments she suffered on her first day back in training with the national team. She returned in 2007 after an eight-month layoff, and was named to the United States' squad for the 2007 FIFA Women's World Cup. Boxx helped the team reach the semifinal match against Brazil, but she was sent off after receiving two yellow cards, and the United States went on to lose 4–0.