She quit. I saw her in February 2007 and she said that she was never coming back. Last year, she was ID'd as doing escort work under an assumed name in LA, something Kaira Marie or Kayla Marie. People who had been with her were saying, 'Yes, the girl turned out to be Tiffany Rayne'.
Anyway, she had started dating someone in the biz and that is why she left initially. If she did a ton of anal, she may have had health issues and decided never to returns, because once you become known for certain acts, you get booked for them frequently and she may never have wanted to do certain things again.