I asked Brer Pav the same thing a while back. He says she's taking a sabbatical from here (probably tired of baby name questions, or has to re-sharpen her talons) and is moderating a board on a UK Satanic site. I looked for it briefly, and couldn't spot it...and Pav was too discreet to say where.
Summer gets a lot of folks involved in other things, so it's not surprising to see a few absences. Pavlos may be able to tell us more about Nan and when/if we're likely to see her back, even briefly.