Okimoto's international debut came in 1997, representing Brazil. Over the years, she has garnered numerous accolades. Notably, she won a bronze medal at the 2016 Olympic Games in Rio de Janeiro. This achievement marked her as the first Brazilian to win an Olympic medal in open water swimming.

| Season | Event | Rank |
|---|---|---|
| 2016 | Women's 10km | B Bronze |
| 2008 | Women's 10km | 7 |
Despite her successes, Okimoto faced challenges. In July 2014, she suffered a back injury that ruled her out of most of the World Cup series that year. Additionally, she had to withdraw from the 10km open water race at the 2012 Olympic Games in London due to hypothermia. She fainted after being rescued and recovered in hospital.
Okimoto's contributions have been widely recognised. She was named the International Swimming Federation (FINA) Female Open Water Swimmer of the Year in 2013. The same year, she was honoured as Brazilian Athlete of the Year by the Brazilian Olympic Committee.
In 2018, Okimoto was inducted into the International Marathon Swimming Hall of Fame. These accolades underscore her impact on the sport and her dedication over the years.
Outside of swimming, Okimoto enjoys watching TV and films, reading, and travelling. She holds a degree in Liberal Studies from Santa Cecilia University (Unisanta) in Brazil. Fluent in English, Portuguese, and Spanish, she resides in São Paulo with her husband.
In December 2017, Okimoto announced her retirement from professional sport. Her decision was influenced by a desire to become a mother and losing sponsors ahead of the 2020 Olympic Games in Tokyo. Despite retiring professionally, she continues to compete in amateur events.
Okimoto's legacy is marked by her achievements and contributions to Brazilian swimming. Her journey from a young swimmer to an Olympic medallist serves as an inspiration for many aspiring athletes.
Okimoto draws inspiration from Brazilian Formula One driver Ayrton Senna and US basketballer Michael Jordan. Her sporting philosophy is encapsulated in a quote by Chico Xavier: "Though nobody can go back and make a new beginning, anyone can start over and make a new ending."
Her story is one of perseverance, dedication, and passion for swimming. As she continues to participate in amateur events, her influence on the sport remains significant.
Okimoto's international debut came in 1997, representing Brazil. Over the years, she has garnered numerous accolades. Notably, she won a bronze medal at the 2016 Olympic Games in Rio de Janeiro. This achievement marked her as the first Brazilian to win an Olympic medal in open water swimming.