[2] At the 2018 José Finkel Trophy, she broke the South American record in 4 × 200 m freestyle relay with a time of 7:50.57 along with Camila Mello, Maria Paula Heitmann and Andressa Cholodovskis.

[3] At the 2018 Summer Youth Olympics held in Buenos Aires, she won a silver medal in the Girls' 4 × 100 metre freestyle relay.

Participating in the Brazilian 4 × 100 m freestyle relay, formed by Giovanna Diamante, Stephanie Balduccini, Vieira and Giovana Reis, she finished in 6th place with a time of 3:38.10.

[12][13] She also finished 10th in the Women's 4 × 100 metre medley relay, along with Stephanie Balduccini, Jhennifer Conceição and Giovanna Diamante.

[16] This is not the first time that Viera has gotten into trouble at a swim meet, as in 2023, she had a dispute with her countrymate Jhennifer Conceicao at the Trofeu Brasil competition.