What does the narrator mean with the claim that Hal tells her clients not only what they wanted to hear, but "What they needed to know as well" in the novel, The Death of Mrs. Westaway?

The narrator points out many of Hal's more noble qualities in Chapter 4 while describing the living she makes as a fortune teller. In one such instance, the narrator states that Hal is "not base enough to tell them only what they want to hear" (23). Instead, she also focuses on telling her clients the things she believes they need to know, such as the fact that truth cannot be "found at the bottom of a bottle," that drugs are "not the answer," and that it is alright "to leave the man responsible for the bruises" visible just beyond "the neckline of that blouse" (23).