Borrell trained as a rhythmic gymnast at the Escuela de Competición of Murcia.

In 1991, she entered the national team as a junior individual gymnast, participating in the European Junior Championships in Lisbon, where she won the bronze medal in the team category together with Rosabel Espinosa, Bárbara Plaza and substitute Peligros Piñero, as well as the bronze medal in the clubs final.

[1] That same year she won the bronze medal in the honor category at the Spanish Championship, held in Torrevieja, where she finished behind Carolina Pascual and Mónica Ferrández.

The renewed starting group for that year was made up of Carolina, Alicia Martín, Cristina Martínez, Maider Olleta, Bárbara Plaza and Pilar Rodrigo, with María Álvarez and Regina Guati as substitutes.

[3] In the European Championship in Bucharest, the Spanish group won the bronze medal in the All-Around and in the 4 hoops + 4 clubs' final, and the 6th place with 6 ropes.