Ferreira, 80, spent 42 days in a hospital in Brasilia.
The cause of death was pneumonia caused by COVID-19, and the death occurred in hospital.
Brazilian President Jair Bolsonaro, the first lady or the presidential administration did not comment on her death.
Jair Bolsonaro was also confirmed positive for COVID-19 in early July. The president developed a fever and coughed, and after almost three weeks was declared cured.
He is known for his categorical position on the new coronavirus, which he said does not exist or is just an innocent flu. Moreover, he took off his mask in front of journalists during a press conference.
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