Using a quote describe how the Nurse has acted as more than a parent to Juliet, that is, how she has been a mentor and counselor, giving her good and positive advice apart from the time she betrays Juliet.
The Nurse has a natural inclination to love Juliet. She has been nursemaid to Juliet as a baby and child, having spent more time with her than her own mother, most likely. So, it is certainly to be expected that the Nurse is very close to Juliet. Although she is loving and loyal, the Nurse teases Juliet; furthermore, she lacks moral principles and is rather short-sighted. Nevertheless, the Nurse does provide Juliet with some positive words of advice.
In Act III, Scene 3, when Juliet learns that Romeo has killed Tybalt, Nurse makes every effort to comfort Juliet; finally, she decides to bring Romeo to Juliet. The next morning after Romeo and Juliet's single night together, the Nurse comes to Juliet's chamber and warns them that Romeo must leave; she cautions Juliet,
Your lady mother is coming to your chamber.
The day is broke. Be wary, look about. (3.5.39-40)
Thus, the nurse ensures that Juliet consummates her marriage and has a night that will be romantic, meaningful, and cherished; she is truly a friend to Juliet in this scene. Then, in the morning, she brings Juliet back to reality and acts as a counselor/mentor to her by warning her about Lady Capulet's approach, and to not act as though anything out of the ordinary has occurred.
Act 1 Scene 3, When Lady Capulet asks the nurse to call forth Juliet, instead of doing it herself, may be a sign that Juliet thinks of the nurse as more of her mother. Also in the same scene "This is the matter---Nurse give leave a while, We must talk in secret----Nurse come back again. I have remembered me. Thou's here our counsel. Thou know'st mu daughters of a pretty age" This is another example that the Nurse has more of a motherly role towards Juliet, because lady Capulet is getting ready to talk to Juliet, but notices she has no idea how to talk to Juliet, so she calls the nurse back.