。
She was taken in by a salesman.
Literal
She [topic-は] salesman [by-に] was-deceived.
A bare-bones passive sentence: subject-marker は for the affected party, に for the agent, and the verb in passive form. だます ('to deceive') becomes だまされる (passive); past tense だまされた. Passive constructions in Japanese routinely carry an adversative undertone — the structure highlights that the subject was the recipient of an unwanted action — so even though English 'was deceived' is a neutral passive, the Japanese frame leans toward 'suffered being deceived'.