[3] On 3 September 2014, participating in the José Finkel Trophy (short course competition) in Guaratinguetá, she broke the South American record in the 4x200-metre freestyle with a time of 7:58.54, along with Larissa Oliveira, Aline Rodrigues and Daniele de Jesus.

[4] In April 2015, participating in the Maria Lenk Trophy in Rio de Janeiro, she broke the South American record in the 4 × 200 metre freestyle relay with a time of 8:03.22, along with Manuella Lyrio, Larissa Oliveira and Joanna Maranhão.

[10][11] At the 2016 Summer Olympics, in the 4 × 200 metre freestyle relay, she broke the South American record with a time of 7:55.68, along with Manuella Lyrio, Jéssica Cavalheiro and Larissa Oliveira, finishing 11th.

[15] At the 2022 FINA World Swimming Championships (25 m), in Melbourne, Australia, in the Women's 4 × 200 metre freestyle relay, she broke the South American record with a time of 7:48.42, along with Giovanna Diamante, Stephanie Balduccini and Aline Rodrigues.

[33][34][35] In the 4 × 200 metre freestyle relay, the team composed of Roncatto, Maria Fernanda Costa, Stephanie Balduccini, and Aline Rodrigues obtained a historic result, reaching 4th place, Brazil's best placement in this event at the World Championships, destroying the South American record with the mark of 7:52.71.