Dear Sunny,
　　　　It's very good that you want to be friends with this girl. In my opinion,you'd better first have a heart-to-heart talk with her,because understanding each other is very important for you two. And I also think it's better for you to ask her to join you and your classmates in all kinds of actives,such as birthday parties,going out for a walk,discussing some fashionable topics,and so on. Besides,helping each other is also very important for both of you. Just share happiness and sadness with her. And I believe she will understand you in time and it is certain you will be good friends in future. Good luck to you.
　　　　Yours,
　　XX