Odebrecht has admitted to paying hundreds of millions of dollars in bribes to win juicy contracts in 12 countries, including Venezuela -- a massive scandal that has rocked Latin American politics.
But no names had yet surfaced in Venezuela.
Ortega, who was fired after emerging as a top critic of Maduro, said the bribe-taking there went all the way to the top.
"They are very worried and anxious, because they know we have details on all the cooperation, amounts and people who got rich, and that investigation involves Mr Nicolas Maduro and his inner circle," she told a meeting of Latin American prosecutors in Mexico by conference call.
She has faced growing harassment in Venezuela, where security forces recently raided her home and the authorities have issued an arrest warrant for her husband, a lawmaker who also broke with Maduro.
She had blistering condemnation for Maduro's government, which has installed an all-powerful Constituent Assembly that yesterday seized the powers of the opposition-majority legislature.
"We have seen how all Venezuela's institutions have degenerated, how they have abandoned the rule of law, been turned into the promoters of a totalitarian government," she said.
"We're living through a difficult situation in Venezuela... Persecuted and dominated with the weapons of hunger and sickness. It's a struggle to find food and medicine in our country. The government is trying to rule the people through poverty."
She also condemned the government's treatment of her, her family and her friends.
"I am being systematically persecuted," she said.
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