Maria Gambrelli's Testimony, Explained：you don't say

She says she tripped over a root and grabbed Ostos to keep from falling, so they both went down by accident. She is correcting her earlier testimony rather than defending herself, and she never treats the encounter as a crime.

She admits one lie: she told Ostos there was someone else, hoping he would suffer after leaving her. Everything else she describes she presents as true, which makes her account hard to dismiss outright.

Maria says he was in a mood that night, babbled in Spanish, then broke down crying. When she tried to console him he turned violent, tearing her clothes and cursing like a madman.

It is an ironic reply used when you hear something unbelievable. When Maria says Ostos broke down and cried, the interrogator answers "You don't say," and she takes it literally, insisting "I do say."

Yes. When she asks if she must return, the answer is "Unfortunately, yes," followed by "But don't give up hope." She is still the prime suspect as the scene ends.