How does the nurse offend Juliet in this act and cease to be her ally development add tragedy of events that follow?

The nurse offends Juliet in Act III, Scene V, by suggesting that she should forget about Romeo and marry Paris. This suggestion enrages Juliet, who sees it as a betrayal of her love for Romeo. The nurse's words also plant doubt in Juliet's mind about Romeo's love for her, and this doubt leads her to take the drastic step of drinking the sleeping potion that Friar Laurence gives her.

The nurse's words have a devastating impact on Juliet, and they ultimately lead to her tragic death. If the nurse had not offended Juliet, she might not have been so quick to take the sleeping potion, and she might have survived.

This scene is a turning point in the play because it marks the end of Juliet's innocence and her relationship with the nurse. From this point on, Juliet is on her own and must face the tragic consequences of her decisions.