The quick answer: Not much.
Like I wrote in the com box of another blog, "I doubt she brought many souls back to the Church when she decided to be Catholic again, and I doubt she will lead many souls out of the Church now that she quit."
People do this everyday - they fall away. There was a parable about the phenomena, something about seed falling on various surfaces, sprouting, dying, etc.. I think this photo of Rice is very telling - Catholic chic - many people love the accoutrements... big rosaries, lovely architecture, classy music, ancient artifacts, gold and lace and satin and embroidered slippers. It feels so holy in a romantic sort of way, huh? And what is more Goth than Catholic Gothic?
I've never been able to read an Anne Rice novel, or sit through a film based on one. I've enjoyed televised interviews with her - but she's just a 'gal' - she could be my sister or the woman across the street, or any romantic novelist. So what? She's as screwed up as the next person. (In fact - she just might be nuts.)
Waddja think 'bout that Clinton wedding, huh?