Okay. What's your answer?
Did you say Helen Lester? Ding. Ding. Ding. You are correct!
Lester also has a book about herself. In Author: A True Story, she tells the good and the bad of becoming an author. Your young writers will see an experienced writer facing rejection, persevering, practicing, using the writing process, being frustrated, being inspired.
They will see that they are much like Helen (well, except that they don't receive royalties for their work). Knowing that they are not alone may make a very difficult process just a tad easier to bear.
If you're not familiar with Murdley and the rest of the characters I mentioned, go to E/Lester on your next visit to the library and fill your bag with Lester's books. They are the kind you won't mind reading for the 20th time.