That shouldn't make a difference... there's a precedent as other books and compendiums/encyclopaedias have been published on many literary works (not to mention Cliff's Notes on basically every literary work)... The fact that information is distributed through another channel such as the Internet shouldn't stop John Doe on the street from compiling that information and presenting it as a text of information, and certainly the fact that the author of the source material doesn't want them to publish should not be a strong enough argument to prevent them from publishing. They should be allowed to distribute this guide as an unauthorized guide to her world, and then if she wants to publish an official one, let her -- and then we'll let the public vote with their dollars.