Snakekate,
Please read the posts below on proper nesting. Good nesting greatly reduces the chances of egg binding.

I would still giver her a large nest as described. Here is a formula I have used based on experienced users on this forum (this method has worked very well for my snakes):

> Fill a large deep plastic storage box with about 8-12 inches deep of nesting substrate. I use coir fiber (e.g. Eco-Earth) mixed with some sand. I use more coir than sand, so the mixture is still somewhat light-weight. Make sure it is not too wet, just barely moist - you can squeeze the coir to remove excess water. It holds burrows quite well. I have also used just sphagnum moss, it worked too.

> Place a large tile on top of the substrate in the center of the box.

> Put in a water bowl.

> Secure the box with the lid. I drill some air holes - I use a stepped drill bit. It cuts very nice holes (I do 3/16" or 1/4" dia), or use a cheap soldering iron to poke holes (outside, because the fumes are horrible).

Cal kings love it, even if the do lots of digging. So do sinaloans.