Castillo played with the Senior National Team that traveled to Guadalajara, Spain for a friendly series. She then played the 2007 Women's Pan-American Volleyball Cup in Colima, Mexico. Her team qualified for the 2008 FIVB World Grand Prix with a 3-2 victory in quarterfinals over Puerto Rico, and finally winning the competition's bronze medal with a 3-1 victory over the United States. Castillo then played in the 2007 Pan American Games held in Rio de Janeiro, Brazil. Her national team lost in the quarterfinals after falling to Peru and ending up in fifth place. Castillo played in August her first Worldwide competition by playing the annual FIVB World Grand Prix in Tokyo, Japan then Honk Kong, China and finally Taipei, were her team won their first competition's match ranking in eleventh place overall. After that competition, she moved in September with her national Senior Team to Winnipeg, Canada, playing the NORCECA Championship. There she won the bronze medal.