Lady Capulet wants to make this marriage news look positive. She informs her daughter about the arrangement to alleviate the grief over Tybalt. She praises Juliet's father and her husband in a way that him being a "careful father". When Juliet refuses, her mother's behavior suddenly changes. The reader can observe sudden change in her character and it seems rather dark reaction. Lady Capulet's final words in this scene is "Do as thou wilt, for I have done with thee" meaning "Do what you wanna do because I'm done worrying about you"