[1] Maggio made her international debut at the Camaiore Trophy where she helped Italy place first ahead of France and Mexico.

[2] She next competed at the Iuvenila Cup in Mexico where Italy once again won gold, this time ahead of Germany and Brazil.

Individually Maggio won gold in the all-around ahead of Thaís Fidélis, vault, uneven bars, and balance beam.

[3] In 2015 Maggio was selected to represent Italy at the European Youth Olympic Festival alongside Caterina Cereghetti and Francesca Linari.

Maggio competed at a friendly competition amongst junior competitors where she placed third in the all-around behind Alice Kinsella of Great Britain and compatriot Giorgia Villa.

Individually Maggio won gold on vault ahead of compatriot Martina Basile and Denisa Golgotă of Romania.

[11] Maggio was poised to compete at the World Championships, however she sustained a knee injury while training that ended her season prematurely.

She competed at the Italian National Championships where she won silver on balance beam behind Giorgia Villa.

[15] On September 4 Maggio was named as the alternate for the team to compete at the 2019 World Championships in Stuttgart, Germany.

During event finals she won gold on balance beam, silver on uneven bars behind Villa, and placed sixth on floor exercise.

[19] In April Maggio was selected to represent Italy at the European Championships in Basel alongside Alice D'Amato, Giorgia Villa, and Vanessa Ferrari.

Maggio was named to the team to represent Italy at the 2020 Summer Olympics alongside Alice and Asia D'Amato and Giorgia Villa (later replaced by Vanessa Ferrari).

On the first day of competition she won bronze in the all-around behind compatriot Asia D'Amato and Alice Kinsella of Great Britain.

During the team final Maggio contributed scores on vault, balance beam, and floor exercise towards Italy's first place finish.

She was later named to the team to compete at the World Championships in Liverpool alongside Giorgia Villa, Alice D'Amato, Manila Esposito, Veronica Mandriota, and alternate Elisa Iorio.

[33] Maggio returned to competition 2024 Doha World Cup but she failed to make any event finals.