I fully agree with Tim there, that is a snow, definitely not a ghost.
The female "seems" to be a bit plump toward the back, and her vertebrae is raised as they can typically beewhen the eggs are forcing it up. But it's tough to say with that particular photo with any real certainty. It all depends on the time frame of the breeding, etc..
See if the female still eats good, then when she quits and is quite obviously more swollen, then that is a DEFINITE good sign she is gravid. Also, I would introduce the male again too, and if she is really gravid and not swelled from ovulating, she will tail-slap and refuse the male's advances which is yet another good sign you want to see.
Approx. 35 days or so(give or take) from the initial breeding, she will have what is called a "pre-lay shed". Then about 7 to 12 days after the shed, she will lay the eggs. Make SURE that you offer her a nice nesting box with moist sphagnum moss right after she sheds so she can get used to it and not stress about wondering where to lay her eggs. They typically crawl all around and go in and out of the moistened moss, and when you notice her hunkering down and staying in there all the time, it won't be but another day or two until she actually lays them.
Good luck!
~Doug
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"a snake in the grass is a GOOD thing" 
my website -Serpentine Specialties