Maggio turned senior in 2017. She made her debut at the 2017 City of Jesolo Trophy where she placed twenty-fourth. She next competed in the 2nd Italian Serie A where she placed first. She was later selected to represent Italy at the European Championships. While there she qualified to the All-Around final where she finished in sixth place. She competed at the next Italian Serie A competition and once again finished in first place. Maggio continued her dominance, winning the Italian Gold Championships and placing first on three of the four apparatuses. Maggio was poised to compete at the World Championships, however she sustained a knee injury while training that ended her season prematurely.