At the 2010 Summer Youth Olympics in Singapore, Marchioro was a finalist in five races and finished 4th place in the 50-metre freestyle. She came close to qualifying for the London Olympics 2012. Represented Brazil in the British Championship, which served as a test event for the Olympics. There, achieved the best life time in the 100-metre (56.15 seconds) and finished fourth in the 50-metre guests final.