Castillo was selected to represent Mexico at the 2015 Pan American Games where she finished seventh in the all-around and qualified for all four event finals.[25] She finished fifth in the ball final, fourth in the clubs final, and sixth in the hoop final and the ribbon final.[26] Then at the 2015 World Championships, she finished fifty-seventh in the individual all-around and nineteenth with the Mexican team.[27][28] This result was not high enough for Castillo to qualify a spot for the 2016 Olympic Games.