In the 2002–2003 season, Cantu trained in Monterrey and Simsbury, Connecticut, coached by Edgar Beckley and Doris Beckley. She was assigned to represent Mexico at three ISU Championships – the 2003 Four Continents in Beijing, China; 2003 Junior Worlds in Ostrava, Czech Republic; and 2003 Worlds in Washington, D.C.. She qualified to the free skate in Beijing and finished 20th. At the event, Cantu's bag with her skates vanished after the short program but her teammate, Ingrid Roth, who had not advanced to the next segment, lent her own skates to Cantu.