Good luck. I'm a pretty big Celia fan, so much that I've searched Google to this extent:
(Yeah, I've got no life. But, the point is, there isn't much info.)
I think her mom died of some kind of heart problem, as I found a page for an institute with her family's names in relation to her, but that was a long time ago and I don't really want to be giving misinformation. If that helps, you could try to dig deeper. That's all I've got biographically, other than what you probably already know.
(One more thing, she went on a roadtrip with Joe Gallagher last year; they blogged it and it's got some pretty nice pictures:
http://nyc2la2007.blogspot.com/)
Last thing, if it helps: her myspace is here:
http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendid=9355891
"My muffin top is all that/whole grain and low-fat/I know you want a piece of that/But I just wanna dance!"