I agree with Kay's characterization of Nanny. I especially agree with the end where she says that Nanny helps Janie grow. During these chapters Nanny consistently gives Janie advice and counsel that help Janie through her tough times. For example In chapter three Janie is crying because she does not love her husband but Nanny says, "Better leave things de way dey is. Youse young yet. No tellin' whut mount happen befo' you die. Wait awhile, baby. Yo' mind will change" (31). Then, after Janie had a chance to think over Nanny's advice, the narration says, "She knew now that marriage did not make love. Janie's first dream was dead, so she became a woman" (32). This is only one instance where Nanny's advice and counsel helps Janie grow. While Nanny's character is static, she helps Janie's character become dynamic.
In the image of Lucy from Peanuts in the Psychiatric booth, Lucy is similar to Nanny because she gives many of the other Peanuts characters advice that sometimes help them, often confuse them, but always change them. While Nanny is not as confusing as Lucy, her advice changes Janie just as Lucy's advice changes the Peanuts characters.