This is a book which has had a great impact on my life. If I'd had the opportunity to read it earlier, it may have had an even greater impact. It is a lovely book originally written by Mabel Hale in 1922. I haven't read the original, though I am sure it is lovely as well, so the version I recommend is the one that is revised by Karen Andreola.
It is geared toward girls who are experiencing coming into young womanhood. If I were asked to put an age on it, I would say 10-13. However, it has less to do with one's age and more to do with one's level of maturity. So, it is a book I would recommend to any girl of any age, young or old.
It is (I say again) a lovely book. Its chapters are each devoted to a specific character trait. The language may be a little old-fashioned, but the lessons taught very much apply in our world today. It touches on honesty, ambitions, home life, and friendships to name a few. I highly recommend it to any girl who is striving to be a biblical lady.