How does Juliet finally get rid of her mother and the nurse in Act 4, Scene 3 of Shakespeare's Romeo and Juliet?

Juliet tells her nurse that she wants to be alone to pray and tells her mother that she will be busy preparing for the wedding and will need the nurse to help her, so she should leave Juliet alone.

Juliet’s father does not give her much time before she is supposed to marry Paris.  She needs to be alone in order to take the special sleeping potion Friar Laurence gave her to fake her death.  Her mother and the nurse won’t leave her side, however.  She worries that they will stay with her all night, so she comes up with excuses and tells them to leave her alone. 

Both Juliet’s mother and her nurse want to help her, because they are worried about her reaction to marrying Paris.  They know she doesn't really want to. Juliet tells the nurse she needs to be alone to pray.  She tells her mother that they already picked out all the clothes she needs and her mother will be busy getting ready for the wedding the next day and should worry about that instead of Juliet. 

JULIET

No, madam; we have cull'd such necessaries
As are behoveful for our state to-morrow:
So please you, let me now be left alone,
And let the nurse this night sit up with you;
For, I am sure, you have your hands full all,
In this so sudden business. (Act 4, Scene 3) 

This is really a sad scene, because Juliet knows there is to be no wedding.  She is already married, and her mother was not invited.  She married someone her mother did not approve of.  Her mother is going to find her dead in the morning.  Although Juliet will not really be dead, she knows that for her mother, the grief will be real.  She is about to give her mother great pain.