The narrator tells the story in the third person, but with a character's words, tone and way of thinking, with no quotation marks and no "he thought": the narrator's voice and the character's merge.
In The Slum
não era decente, nem tinha jeito, dar homem a uma moça que ainda não fora visitada pelas regras! Não! Antes vê-la solteira toda a vida e ficarem ambas curtindo para sempre aquele inferno da estalagem, it was not decent, nor proper, to give a man to a girl who had not yet been visited by her monthly courses! No! Better to see her single all her life and have the two of them suffer forever in that hell of a tenement
The narrator does not say "she was thinking," but the past tense "was not decent," the exclamation and the "No!" make Dona Isabel's thought sound inside the narration, with no quotation marks and no verb of saying.
Chapters III to V: The Tenement Wakes and Romão Hires Jerônimo, the narrator