Diacci competed at the 2013 City of Jesolo Trophy, and the Swiss team finished 5th. Individually, she finished 7th in the balance beam event final. At the 2013 Doha World Cup, she finished 7th in the balance beam event final. She competed at the 2013 European Championships where she finished 31st in the all-around during the qualification round. She competed at the 2013 DTB Team Challenge in Stuttgart with Nicole Hitz, Ilaria Käslin, and Sara Metzger, and the team finished 4th. She won the bronze medal on vault at the 2014 Swiss Championships. She competed at the 2014 Stuttgart World Cup with Ilaria Käslin, Stefanie Siegenthaler, and Nicole Hitz, and they won the team bronze medal behind Germany and Russia.