How big is the cage they are in? How old are they? She looks like a full adult and is probably very stressed by having the male in the same cage - you HAVE to change this. From the looks of your girl she may very well be gravid (eggs) and going down means she is looking for a place to lay. If she is not provided this (a laying tub) you can end up with an eggbound and dead cham.
You should have had the funds and forethought to be prepared for this before you got them. I am not going to chew you out b/c what is done is done, but if you want to keep these chams and make sure they are healthy you really need to do something. The fact that they are always out says a lot. I can leave Luna's door wide open with her climbing rope attached and somethimes she will wander and other times perfectly happy to stay in her cage.
In the meantime... you can get reptarium (certainly not my first choice, but better than nothing) or screen cages (better choice in my opinion), fairly inexpensive on ebay (see link). Stress may not show right away but it can manifest in many diseases and nutritional problems. An adult veiled should be in nothing smaller than 2x2x4' screen cage.
If you want to give them roaming room set up a jungle gym. Go to my photo gallery to see the basics. gallery.pethobbyist.com/index.php?user=28017&cat=500&subcat=418You can use window cord, bungie cord, whatever they can easily maneuver on. I use cup hooks in the ceiling to loop the rope (make sure it is secure!) and since they prefer to go up I really don't worry about her climbing down the screen to the floor the ONLY time she did this was when she GRAVID. Just make sure they are back in at least an hour before lights out so they can bask and drink (especially important if out in a dry room).
Can you also tell us about the rest of your setup? Food, supplements, gutload, lights, water humidity, etc. If you have already posted this direct us to that post (can't read and remember everyone! 
lele
here is a listing on Ebay. You don't have to do the bidding thing if they have an option to "[Buy Now" price.
ebay cages
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0.1 veiled - Luna
0.2 house geckos - Gaia & Tia (both MIA 
0.2 felines - Kyndra and Líta
1.0 African Clawed Frog (for summer)
0.5 Mad. Hissers (for summer - all girls, no little ones, whew!)