I think this one comes down to a case of more than one person can have a name.
Technically, as Violet Blue the pornstar is in IMDB with 165 movies,
http://www.imdb.com/name/nm1013326/ ,I think that the pornstar is in a pretty good position - plus having the name in a company. That the trademark was only issued in 2007 gives a pretty wide open field for anyone with prior use.
The journalist sounds like she recently became aware of this situation and is now trying to profit from the hard work of the pornstar.