Magistrati turned senior in 2019. She made her debut at the Club Championships where she placed first in the all-around. She made her senior international debut at the South American Championships where she placed first in the all-around and helped Argentina win the team title. During event finals she won silver on balance beam and placed seventh on floor exercise. She next competed at the Pan American Games where she helped Argentina place fourth. Individually she placed eighth on uneven bars and floor exercise. At the Argentinian national championships she placed third in the all-around and first on floor exercise. Magistrati was selected to represent Argentina at the World Championships in Stuttgart, Germany. During qualifications she finished 36th in the all-around and did not qualify for the final. Also, because teammate Martina Dominici finished ahead of her, Magistrati did not qualify an individual berth to the 2020 Summer Olympics due to the one-per-country limit.