My friend hurt me so much because I acted against her wish. Now I am avoiding her. Is this the right thing to do?

It sounds like that both of you may need to re-evaluate what it means to be a friend and what expectations each of you have for the relationship you share. Your friend had every right to feel hurt if you purposefully acted against her wish. However, she would be equally at fault if she in turn retaliated against you just to hurt you. Try incorporating positive responsiveness when interacting with any friend you have. Reflect on the situation prior to responding. Think about how your actions or words will impact you, her, or others prior to speaking or behaving. Does it add to the good of the relationship, or does it add more frustration, hurt or anger?