There's a few girls who stood out in looks and personality that went pretty MIA. Reminds me of Tessa West (Sophie from Money Talks/Reality Kings), Bailie Stone / Bailey Stone, Nikki Monroe, Kalani Breeze, and Angel Rain...although the last one, sadly, passed away.
In this case Peta went the Tessa and Bailie Stone route aka found god, went through some life changes like moving/married/kid/etc, wanted to leave the business far, far in the past. Which frankly is entirely their decision. It just starts to get really weird when some company keeps running their personal website and twitter accounts...like in Peta's case. It makes everyone wonder if they're really gone gone, or just "retired" but will unretire for $.