2018 was a breakout year for Petisco. Early in the season she competed at various Spanish League competitions and recorded the highest all-around score at the second one held in April. In February she competed at the Mallorca Cup where she finished seventh in her division. She competed at the Youth Olympic Qualifier where she placed 17th and qualified a spot for Spain. Petisco next competed at the Spanish National Championships where she placed second in the all-around, behind Alba Asencio, as well as second on uneven bars and balance beam. She next represented Spain at the European Championships. During qualifications she helped Spain finish 11th as a team and individually placed 36th in the all-around.