Mariani finished fifth in the all-around at the Glasgow World Cup. At the City of Jesolo Trophy, she won a bronze medal with the Italian team and also placed eleventh in the all-around, sixth on balance beam, and fifth on floor. She competed at the European Championships alongside Elisa Meneghini, Lara Mori, Martina Rizzelli, and Sofia Busato, and they finished fifth in the team final. She was not selected for the 2016 Olympic team.