[4] At the 2010 Summer Youth Olympics in Singapore, Marchioro was a finalist in five races and finished 4th place in the 50-metre freestyle.

[8] In the 4×100-metre freestyle, she broke the South American record, with a time of 3:41.05, along with Daynara de Paula, Graciele Herrmann and Larissa Oliveira.

[14] At the 2014 FINA World Swimming Championships (25 m) in Doha, Qatar, Marchioro won a bronze medal in the 4 × 50 metre mixed freestyle relay, by participating at heats.

[15][16] Marchioro also finished 7th in the Women's 4 × 100 metre freestyle relay (3:33.93, South American record), and 8th in the Women's 4 × 50 metre freestyle relay (1:38.78, South American record), both relays formed by Marchioro, Daiane Oliveira, Larissa Oliveira and Daynara de Paula;[17][18] and finished 21st in the Women's 100 metre freestyle.

[19] Marchioro also swam the heats of the Women's 4 × 50 metre medley relay, with a time of 1:47.20, South American record.