She was selected as the referee for the Women's World Cup in 2015, which took place in Canada. Her official World Cup debut took place on 8 June 2015, at Winnipeg Stadium before more than 31,000 people. As the referee of the match between United States and Australia, she issued three yellow cards and the USA won 3-1. She was the referee again on 16 June, the last date of Group C. She gave five yellow cards in Cameroon's 2-1 victory over Switzerland. She was appointed to referee the quarterfinal match, between England and Canada, played on 24 June before more than 54,000 spectators at BC Place in Vancouver. Umpiérrez gave two yellows and England won 2-1. In addition, Claudia was twice the fourth official, once in the World Cup Final, a match in which the United States defeated Japan 5-2 and won the title.