[8] At the 2023 World Aquatics Championships held in Fukuoka, Japan, she reached the final of the Women's 4 × 200 metre freestyle relay, finishing in 8th place.

[17] In the final, Mafê broke the South American record again, now with a mark of 4:02.86, finishing in 4th place, just 0.47s from bronze, this being the best result of all time for Brazilian women's swimming in World Championships.

[22][23] In the 4 × 200 metre freestyle relay, the team composed of Maria Fernanda Costa, Stephanie Balduccini, Aline Rodrigues and Gabrielle Roncatto 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.

[24][25] The quartet formed by Costa, Balduccini, Rodrigues and Ana Carolina Vieira also finished 6th in the 4x100m freestyle, equaling Brazil's best result in world championships in this event.

[30][31] In the Women's 4 × 200 metre freestyle relay, Brazil qualified for the final, where she opened the race by breaking the South American record with a time of 1:56.06.