She just posted a new story recently, but yeah I hear you. We had just started co-writing a story a couple years ago when *poof* she disappeared completely until a couple weeks ago when posting that story.
Wish she was around more. She is one of the best authors we've got.
She hasn't... at least not entirely. She floats on in from time to time. She's more based on Deviantart http://heliumgirl77.deviantart.com/