Two things: Ask one question at a time and cite the Act and scene you want and answer from. Otherwise we edit your question down to one, and have to guess where you are asking from.
When Juliet is left with her mom and the Nurse, Lady Capulet says:
Talk not to me, for I'll not speak a word:
Do as thou wilt, for I have done with thee.
She is essentially saying that she is washing her hands of Juliet. She doesn't care anymore. She doesn't want to even talk about it anymore.
The nurse is much more compassionate demonstrating that their relationship is much tighter than Juliet and her mother's. Juliet asks for advice and the Nurse lovingly gives advice that is genuine based on the situation:
Faith, here it is.
Romeo is banish'd; and all the world to nothing,
That he dares ne'er come back to challenge you;
Or, if he do, it needs must be by stealth.
Then, since the case so stands as now it doth,
I think it best you married with the county.
O, he's a lovely gentleman!
Juliet doesn't like this answer, but at least it was done with care and concern.