This all because US society views sex as something shameful, especially when it's a woman being sexual. I think that all these anti-porn laws we're seeing in the US is about controlling free speech, and controlling sexuality (women's moreso than men's)
If what she's doing on her own time isn't illegal then employers should not be able to fire her for it.
I guess the silver lining of all this is that she made a million bucks in six months. If she's smart with her money and invests it she could set herself up for life after doing this for few years.