In Act 3.5, Lady Capulet comes to her daughter after her cousin Tybalt has been killed by Romeo. She sees Juliet is distressed and asks, "Evermore weeping for your cousin's death? / What, wilt thou wash him from his grave with tears?" (2.5.69-70)
Juliet's mother completely misunderstands the cause of her daughter's emotional pain. She tells Juliet that she will soon be happy, for
...early next Thursday morn
The gallant, young, and noble gentleman,
The Country Paris, at Saint Peter's Church,
Shall happily make thee there a joyful bride (3.5.112-15).
The exchange highlights just how little Lady Capulet understands her daughter. Juliet has just told her mother how pained she is a few minutes before: "O, how my heart abhors / To hear him nam'd, and cannot come to him, " she wails, speaking not of Tybalt, but of Romeo (3.599-100). Whether consciously or subconciously, her mother misinterprets, and vastly underestimates, her only child.