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. 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; and finished 21st in the Women's 100 metre freestyle. Marchioro also swam the heats of the Women's 4 × 50 metre medley relay, with a time of 1:47.20, South American record.