Earlier in the Act than the above referenced examples, Juliet tells her parents 'No, thank you,' in reference to marrying Paris. It would take a considerable strength and confidence to have said no to parents in that culture. Not only did she say no to her mom to tell her dad, she continued to tell her dad no, and then asked her mom again to tell her dad to at least delay the marriage.
Juliet stood her ground with them. When the Nurse then bailed on Juliet, she still remained on target with her purpose, to stay with Romeo and not marry Paris.