-PJ
Moore would be protected under most "shield laws". She is a writer/commentator that derives a wage from her work, at least I understand she does.
However, that provision wouldn't do much to insulate from a legitimate claim of slander or libel, at least not directly. If she has said something the she knew was untrue with malice aforethought, and Palin can prove that (big if), then the shield law won't help her, in any way.