This was a very good book for girls. I bought this book for my daughter and she said that it helped her a lot with her friendships and helped her be a better friend then she is. I am most definitely going to buy more books of the series. I would suggest that you get it as well.
I bought this for my 8-yr-old and it is not really age-appropriate for her. We just started the book, but much of the stuff doesn't apply to her. The book deals with stuff that maybe 10-12 yr-olds might be dealing with in the public school system - our daughter is home-schooled and isn't exposed to very many friendship problems, for instance, how to deal with the "popular" girl in school that everyone wants to be friends with. Many of the concepts/topics covered in this book are good to talk about with your daughter to help her in the area of making good Christian friendships that will last.
This is a fantastic book to help young girls be a friend and to do develop strong friendships with a Christ-like heart. We use it with our GALS Club. It is such a great help in encouraging the girls to be friends.