Investigators with the Manhattan district attorney’s office learned the call had been recorded and had it translated from a “unique dialect of Fulani,” a language from the woman’s native country, Guinea, according to a well-placed law enforcement official.

When the conversation was translated — a job completed only this Wednesday — investigators were alarmed: “She says words to the effect of, ‘Don’t worry, this guy has a lot of money. I know what I’m doing,’ ” the official said…

Little by little, her credibility as a witness crumbled — she had lied about her immigration, about being gang raped in Guinea, about her experiences in her homeland and about her finances, according to two law enforcement officials. She had been linked to people suspected of crimes. She changed her account of what she did immediately after the encounter with Mr. Strauss-Kahn. Sit-downs with prosecutors became tense, even angry. Initially composed, she later collapsed in tears and got down on the floor during questioning. She became unavailable to investigators from the district attorney’s office for days at a time.