Petisco turned senior in 2019. She made her senior international debut at the DTB Team Challenge where she helped Spain finish eighth as a team and individually she placed 14th in the all-around. She competed at the European Championships but failed to qualify for any event finals. Petisco competed at the Flanders International Team Challenge in Ghent, Belgium where she helped Spain finish 6th and individually she finished 13th. At the Spanish National Championships Petisco finished 6th in the all-around but won silver on floor exercise behind. In September Petisco competed at the Szombathely World Cup where she qualified to the uneven bars final. During the final she finished in fifth place. Petisco next competed at the 2nd Heerenveen Friendly where she helped Spain finish second behind the Netherlands and individually she placed 13th in the all-around.