I really think that Bethesda ought to do this girl a solid and smack this criminal scum down Fus Ro Da style on behalf of her, fans everywhere and to defend their own intellectual property.
Here is the video which many of us know and love, which is under attack: http://www.youtube.com/watch?v=4z9TdDCWN7g&list=FLAmgiArvvL91vdSrUBemP1w&index=1&feature=plpp_video
Better yet, let them make and enforce the "claim", and profit from it. The smack them with damages (lost advertising revenue on a song Bethesda owns + cout costs) and a criminal fraud case.
Because really, until they actually enforce their fraudulent claim, its not so much Bethesda's problem. But once they do, it is- big time.
Assuming she wants to avoid that, the EFF is a pretty good place to turn for things like this.