She can guest, but not focus on Gotham. Jason Blood fits Gotham, Zatanna not so much.
everyone thinks he has died
And are ignoring it. I figure the superhero community is all "Batman, dead? Yeah right. He's just setting up a big 'Gotcha' moment and is currently hiding in some shadows behind me. Nevermind my super senses. HE IS BEHIND ME, LA LA LA."