That, too. Also miscommunication about one of her last sets before she first quit.
She didn't get told until just before shooting, basically, that the scene was going to be a threesome, and there was going to be some roughness/rough stuff. She's normally okay with that, but with some heads up at least (a shoot she was going to do in the next two days after that got cancelled, because of all the bruises the male talent in the scene left her with.)
Apparently according to the interview she did about it, 'She asked if they could fake rough behaviour in the scene but the male actor did not "comprehend that information".' And if I recall right about that scene, it was James Deen as the guy in and aren't there rumors about him having a fondness for rough stuff in basically every scene he shoots?