Then what is art? it's something you do by leisure? just because just want to do it? just because suddenly your mind says to you "hey, I think I wanna express something to the world! grab a pencil!"........?
I think it's a very limited definition. Maybe it would be understantable if you were forced to do it in mass... and just in some limited cases.
But doing that because it's your job doesn't make it "work" instead of "Art". If that made sense, then all of the Renaissance artists were workers instead of artists. Sometimes I get paid for drawing stuff and I still consider it art, because I find them beautiful and I'm proud of them.
I've studied arts, and I can confirm that if a canned piece of poop can considered a piece of art (Dadaism), then anything can be considered art, maybe not appealing art, but at least art for the point of view of the author.
If you all want to stop this stupid discussion, just do the obvious: go PM the author and ask her "Excuse me, do you consider what you did there fanart or fanwork?"