Almirao qualified for the women's 400 metres at the 2004 Summer Olympics in Athens, by winning the gold medal from the Ibero-American Championships in Huelva, Spain.

Almirao eventually joined the national sprint team for the women's 4 × 400 m relay, along with her compatriots Josiane Tito, Lucimar Teodoro, and Geisa Coutinho.

For her first event, 400 metres, Almirao ran in the fourth heat against six other athletes, including Great Britain's Christine Ohuruogu, who eventually became an Olympic champion in the final.

[3] Few days later, Almirao reunited with her teammates Lucimar Teodoro, Josiane Tito, and Emmily Pinheiro for the women's 4 × 400 m relay.

[4] Almirao is also a full-time member of Associação Profissional BMF in São Caetano do Sul, being coached and trained by Japanese-born Katsuhito Nakaya.