a xantho first
in your help form you said that you have had the animal for 3mths, and no current supps at the moment? if what you are telling me is that the animal has not had any supps for the last three mths, then i would say it needs a vet visit immediately.
however, that being said, you can only do what you can do, and if you arent able to get her a vet visit NOW then (based on the above assumption), and i have never said this before, (except earlier in this thread), i would say that the next best thing, would be to get her some IMMEDIATE reptile multivites with preformed vitamin A. at this point i think it is probably more important to get that started than to worry about brand or schedule, so if that is the case, i would just go out today and get her the first preformed vitamin A product you come across, the most commonly available of these would probably be reptivite. (shock xantho just recommended reptivite, did i really just say that?)
i would never offer more cricks than you expect her to eat in the next hr and cricks should never be left in overnight. real sunshine or not, all of your animals need a small amount of weekly plain no d3 calcium, if they havent been getting it, then imo, a couple doses of liquid calcium glubionate might be called for before you start a powdered calcium regimen, you can get that here;
http://www.beautifuldragons.com/Reptilestore.html
as far as size, i would say based on the original picture that her size is not unusual for a full grown captive female xanth that hasnt been optimally cared for, so age might be easier for you to guess than me, if she looked considerably smaller and younger when you got her, then i suppose its possible for her to be only 6 mths, but imo , she is likely older, generally speaking i wouldnt expect your captive chams to get as large as ones you may have noticed in the wild.
as far as the guy you got her from, i wouldnt place a whole lot of weight on anything he says, imo, anyone selling xanths by the roadside, isnt doing it for their love of the animals and he is probably thinking better chance of sale if he calls them captive bred. grabbing a wild gravid xanth off of a bush and bringing her home to birth does not really qualify as captive bred, and wouldnt really reduce her chances of being pathologically infected one bit. even if she were captive bred of captive born parents, the fact that she has likely been in close proximity to, and shared other husbandry equip with likely wild caught xanths makes chance of infection more probable than not.
imo, anyone who cares about the animals, and truly has an 18 yr history of breeding them, would be more than happy to offer any assistance they can, but thats jmo.
we already know that there is a strong likely hood of gross hematuria, (visible blood in the urates/urine) which is indicitive of kidney or other urinary issues. but what we dont know is if there is blood in the feces, if there is bright red, meaning undigested blood, in the feces (hematochezia), then that would imo, be more likely indicitive of pathological infection. there is a crude self test you can do for this. since its not conclusive, if it turns up negative, then it tells you nothing, since there could still easily be blood in the stool anyway, but if it turns up positive, than i would say the chances of pathological infection are high.
simply take some nitrile or even dishwashing gloves (and throw them away afterwards), take a freshly laid pooh, and smear it on a white index card or other piece of heavy white paper, if there are tinges of bright red, then, she is almost certainly hematochezic and likely infected with some form of parasite.
i wouldnt use plain latex gloves for this test as they could break open during the test. and just for the record, always sanitize your self after dealing with any sort of fecal/urate cage cleaning issues as well as handling your chams.
kinyonga correctly points out that there is often an area under or around the fringes of the turret that is naturally red, this is normal and not really indicitive of a health problem, which is a different issue than bright red on the eyeball itself or within the eye socket. so if that is the case, please elaborate and include macro pics if possible. there is a similar region in the gular (under the throat) area, sometimes the armpits as well.
generally speaking a 2x2x4' would be plenty for a truly captive bred xanth, but a wild caught xanth that is having acclimation issues, that might be another story. generally speaking, i would consider the way the cage is setup more important than the size.