Siwa was born on February 4, 1924 in São Paulo, São Paulo, Brazil as Aparecida Maria de Castro. She was an actress, known for Os Apavorados (1962), Crônica da Cidade Amada (1964) and Eu Sou o Tal (1959). She was married to Vagareza. She died on April 2, 2009 in São Paulo, SP, Brazil.