Whenever someone asks me which book is my favorite, I have to honestly say that I love all kinds of books. I read constantly. Usually I am reading two books at the same time. And I read across genres.
What about your character? What does she like to read? What is it about her preferred genre that she enjoys?
Your task is to generate a list of at least five different things that your protagonist reads. Include a variety of materials, including papers and magazines.
Once you have established the list, narrow it down to the two that you feel could be influential in a story.
Put things in motion. Perhaps she is in the library reading her favorite periodical. How does she react? What feelings run through her head? What happens when someone walks up and interrupts her reading?
Write the story. When you finish, reread for details. Make sure that something compelling happens.
Have fun with this one.