a great site for finding Teen Chick Lit Books...(it features some other books outside of the regular chick lit genre as well that girls will also enjoy, including supernatural novels featuring strong female characters)
The Ordinary Princess by M M Kaye - a sweet fairy tale that's great for girls 8-12 years old. It features a strong female character who knows what she wants and goes get it. Yet, the story is sweet and romantic as can be (not Hunger Games here). I recently reread my copy and realised that I have forgotten how whimsical and gorgeous the illustrations were.
Kidd (The Secret Life of Bees) is no stranger to strong female characters. Here, her inspiration is the real Sarah Grimké, daughter of an elite Charleston family, who fought for abolition and women’s rights.