My DD12 writes very interesting, imaginative stories occasionly, but has no passion for writing. My DD8 has mild dysgraphia (a learning disability re writing) and finds it practically impossible to write her thoughts down (though she dictates a great story!) I read a series of books when I was a teen that really made me want to write. The first book in the series of three is called Emily of New Moon. They are written by Lucy Maud Montgomery (the same person the wrote the Anne of Green Gables stories). Your budding authors, especially girls, might enjoy this book.