Leolini competed at various national competitions in 2010 and 2011. She made her international debut at the 2011 City of Jesolo Trophy, in which Italy placed third in team finals.[1] In November Leolini competed at the Top Gym Invitational in Belgium where she placed second in the all-around behind Evgeniya Shelgunova of Russia.[2] She also won silver on uneven bars and floor exercise.
In 2012 Leolini competed at the junior European Championships where Italy won silver in the team final.[3]
Leolini became senior in 2013. She competed at the 2013 World Championships. She placed 22nd in vault qualifications and did not qualify to the final.[4]
Leolini competed at the 2014 City of Jesolo Trophy where she placed second on vault behind MyKayla Skinner of the US. She also placed 22nd in the all-around.[5]
In 2015 Leolini competed at the European Games where Italy placed fifth in the team final.[6]
