I'm stuck with when 'lui' means he *or* she ...

Bonjour Stuart, Lui is two different kinds of pronouns. When it's a stressed pronoun, it only means him, because there's a feminine stressed pronoun: elle. Lesson: https://progress.lawlessfrench.com/my-languages/french/view/722 When it's an indirect object pronoun, it can mean him or her because there is no separate feminine pronoun. Lesson: https://progress.lawlessfrench.com/my-languages/french/view/710 In "I speak of her," her is the object of the pronoun of and therefore must be translated by the stressed pronoun elle, not the indirect object lui.

Laura-- I really appreciate your explanations. I came here because I'm trying to understand why lui is used in this sentence: "Tu lui a fait confiance" (You trust him) Is this because faire is followed by à or any other reason?