At the beginning of the play, Juliet obeys her parents. She listens to her mom when she says to think about getting married. Although she is not interested in marriage right then, she still tells her mom that "It is an honor that I dream of" (1.3.66). Here Juliet is talking to her mom and the nurse about her interests of getting married and what she thinks about it. Juliet also trusts the nurse.
During the middle of the play, there is some change in Juliet. At a party, she meets Romeo. The next day, they get married. This marriage, though, she does not tell her parents bout, but then she tells the nurse so that she cam arrange the marriage with Friar Lawrence and Romeo. That same day, Romeo kills Tybalt and is banished from Verona. After all this happens, her dad starts yelling at her because she will not marry Paris.
In the end of the play, Juliet is disregarding of what her parents say. Her dad is yelling at her for not wanting to marry Paris. Then, the next day, she goes to her dad and tells him that she has done wrong to argue against him and that she is sorry. She may say this, but she does not actually mean it. Following the argument, she and the nurse talk, and the nurse advises Juliet to marry Paris. After this, Juliet feels hurt inside because now she can only trust the friar and Romeo.
From the beginning to the end of Romeo and Juliet, Juliet goes from obeying her parents to completely disregarding them. Outside of this play, it is possible for one's personalities to change. If someone were to do something and then be sent to jail, for instance, they would see that if they kept doing that bad thing that they did, then they would try to change so they will not be sent to jail for a longer time. That is how Juliet changes throughout the play, Romeo and Juliet.