You said..."top of cage is 80 and bottom is 75"...the basking temperature could be a little higher...but IMHO its not outside the acceptable range for a young chameleon.
Do you know what parasites she has? What was she given to get rid of them?
Your cage would be fine if the lid was screen and you drilled a few holes in the plexiglass to create a vent area so that the air would flow.
As was indicated, the UVB should not pass through glass or plastic...and should be able to be within about 15 inches of the chameleon. The most often recommended UVB light is the long linear fluorescent tube Repti-sun 5.0.
Does she ever open her eyes? (For instance, if you take her out of the cage will she open them? Is there any goop in her eyes?
You said..."What humidity % should her cage be at?"...I keep my female at the same humidity that I keep veileds at.) As long as she is well watered, the humidity is less of a concern.
You said..."What type of basking light should she have?"...I use a regular incandescent household bulb in a domed hood for a basking light. The wattage is determined by the temperature it produces.
You said..."She seems to not be able to poop very well"...do you think that the amount of poop coming out is about the amount that should be coming out for what she's eating? What do you mean by she can't poop very well if you don't mean the amount? Does she bask? What is the temperature in the part of the cage that she sits in most of the time?
You said..."I haven't been dusting her food with anything either because I don't know which one is the right one, so if someone could suggest what to get that would be great"...I use Rep-cal with and without D3 and I use Herptivite. (BTW...I have a female that I have had for about 3 years and she was full grown when I got her....and I've kept chameleons for over 20 years.)
Exposure to UVB will allow her to produce D3 which will allow her to use the calcium in her diet.
Now...many of the insects used as feeders have a poor ratio of calcium to phosphorus and to help balance it its important to dust the insects before feeding them to her with a phos.-free calcium powder at most feedings.
I dust twice a month with a phos.-free calcium/D3 powder to ensure that the chameleon gets some D3 without overdoing it...allowing her to get the rest of it from the exposure to the UVB. D3 from supplements can build up in the system and cause problems....so don't overdo it.
I dust twice a month with a vitamin powder that contains a beta carotene (prOformed) source of vitamin A. Beta carotene won't build up in the system like prEformed vitamin A will but there is controversy as to whether all/any chameleons can convert it so some people give a little prEformed once in a while. Excess prEformed vitamin A can interfere with the D3 and push the chameleon towards MBD.
Calcium, phos., D3 and vitamin A are important players in bone health and need to be in balance. When trying to balance them, its important to look at the supplements, what you feed the chameleon and what you feed to the insects.
Gutloading/feeding the insects a nutritious diet is important too, then. Crickets, roaches, superworms can be fed a wide variety of greens (dandelions, collards, kale, endive, escarole, etc.) and veggies (carrots, squash, sweet potato, sweet red pepper, zucchini, etc.).
Here are some good sites to read that will explain a lot of this...
http://www.uvguide.co.uk/
http://web.archive.org/web/20060421.../index.php?show=6.Vitamin.D3.and.Calcium.html
http://web.archive.org/web/20060502...rnals.com/vet/index.php?show=5.Vitamin.A.html
http://chameleonnews.com/?page=article&id=102
http://adcham.com/