I donĀ“t care how much money she's doing.. As she doesn't complain excuse or justify it like PewPieDie or whatever he call himself lol Copyright owners are there to make something if she is breaking some law, and i believe they will get their job done, so no concern from me about that.
As of fan vs original.. Artists working with publishers (DC, Marvel, Image, etc) Do fanart for a living if that is the case, with a contract of course, but are not their OC afterall. There are many fans that know/love to draw and make fan art for love, or because someone at a con ask for it, or because they posted it online, people love it and ask for a piece in the con, and that is fine too.
But then, there is some people that just live from other people creations, they're not fans even, just know how to draw, find a mainstream popular character and voila, there is money on the table for them. These people usually don't have original works (OC, comics, illustrations) because all his business is fan art based.
That bothers me? Yes.. I would love to know someone make fanart from one of my characters because he really liked it, i wouldn't mind if someone draw great in another style, and someone ask him/her for a fanart from my OC and he charge for his time. But i would be mad from someone making money from my creativity and doing nothing original.