Hi Ivy,
The way your post sounded and that you were new here made me wonder. It can be so difficult sometimes on forums when you don't know someone's background. There is another cham forum I have frequented for 3+ years so I know most members and they know me. When a "newbie" shows up with what sounds like a frantic question (exclamation points) and no history one has to assume minimal knowledge, so I apologize if it sounded harsh
As I am sure you know, chameleons do have differing requirements and can be very fussy about their nesting/laying setup. chameleonnews.com has a great article on that subject. Nice large setup but although they may seem OK togehter now you may want to separate them if she is indeed gravid. How old are they?
As for laying setup, I found a combo of washed playsand ($4-5 at home depot for 50lb bag) and coco-fiber (eco-earth is one brand) to be a great mix. you can also use peat instead, but I prefer the coco-fiber. Almost a 50/50 mix, moist enough to hold a tunnel. Tub should be deeper than she is long and wide enough hwere she can choose where to dig.
There are plenty of folks who have more experience than I do (I never bred Luna but she had several infertile clutches so that part is the same

) and will be ahppy to help I am sure.
There is one other book by Linda Davison
Chameleons: Their Care and Breeding that I don't think was mentioned.
Hope all this helps, again I apologize for any offense and am sure you're a good critter mom
lele