"He shows her the newspaper."
Translation:Ele mostra o jornal a ela.
Yes, for the 3rd singular person. Lhes, os, as for the 3rd plural person. Mostrar can be either transitive direct or indirect. (That what i meant at first, not transitive or intransitive) "Ele mostra a revista" (direct) ="ele A mostra" / "ele mostra a revista para ela" (indirect) = "ele LHE mostra a revista". Show me the magazine = mostre-me a revista