See what I mean? Porn fandom seems riddled with idiots that think (lack of) attraction to a particular race has anything to do with having racist values. It doesn't. It just means you don't want to fuck them.
If that what she thinks/has been lead to believe, it sounds like a logical business decision rather than her being a racist. Like you say, it's probably ill-conceived, but it still doesn't make her racist.
I've probably said all I can/need to. The world seems full of people who want to play the racism card when something isn't how they want it to be, and I guess porn is no exception.