Gossip Girl Writer does not Write Gossip Girl

reading this article http://www.observer.com/2008/
gossip-girl-creator-cecily-von-ziegesar-seeks-cum-laude?page=0%2C1
I noticed this quote:

Ms. von Ziegesar, meanwhile, has been preparing to make the transition for some time now. Though her name still appears on the front cover of all the Gossip Girl books—volume one came out in 2002—she stopped writing them herself almost three years ago, handing the reins to a stable of ghosts employed by Little, Brown. But this is a luxury most YA authors—especially the ones in their 20s who fell into the work after getting English degrees and M.F.A.’s and moving to New York—cannot afford.

um, what? I thought you wrote the books with your name on the cover, or if not at least kept it secret.