I have read a couple of different books by Lisa Tawn Bergren, and have enjoyed them all. Some contain more adult content, but they are still very well written books.
Some of my favorite by here is her Remnants Trilogy, and her River of Timer Series.
She writes Christian teen romance novels, as well as some adult in there.
I would definitely suggest her to any teen girl!
My question for You: Do you like teen romance novels?