Hi, thanks for answering the questions. I see a few things that could be causing her to not be very active. That's good that you're using a tube UVB rather than a coil or compact. If you could look at the side of the tube, the brand name and % of output should be printed right on it. Could you see what it says and let us know? Once we find that out, we can let you know if the distance of 11" away from is where it should be placed.
I suggest you remove the crushed walnut shells right away and you could even replace with paper towels for now until you get the tiles. The shells have very sharp edges and are also an impaction risk. When they ingest them, the shells can cause damage to their insides so we don't recommend they be used because they are very dangerous.
The basking & cool side temps sound good but since you are using a circular, round gauge thermometer, you're not getting accurate readings. The only 2 ways to get good readings are with either a temperature gun or a digital thermometer with a long wire & probe end. You can get one like this at Walmart for about $12.00 and it is the AcuRite brand.
If you use a digital thermometer with a long wire & probe end and it has dual readings like this one, then you lay the probe end so that it is resting on the basking site with the thermometer part way over on the bottom of the cool side, wait about 45 min for the temp to stop rising, then the "out" reading will be for the basking spot & the "in" reading for the cool side.
Since you don't really know what the temps are now, she could very well be dehydrated. I suggest you give her a nice warm
bath (test the temp by the inside of your wrist, should feel warm but not cold or hot.) Be sure to put a washcloth down in the sink or container to keep her from sliding around. The water level should be up to her shoulders or covering her front legs. With her vent (where she poos) right down in the water for about 15 to 20 min, it will help her with proper
hydration.
Bathing 3 to 4 times a wk is a good idea.
Do you know if she is under a yr old? If she is 16", it's really hard to say how old she is, probably just under a yr. Their size is affected by UVB, calcium intake, food, etc so hard to pinpoint her exact age.
Collard greens are a good staple green. Here's a site that shows other good ones to feed:
http://www.beautifuldragons.503xtreme.com/Nutrition.html Since she may be under a yr old, she should still be getting quite a few crickets or other live feeders like superworms (very cheap), hornworms, silk worms, butter worms. Protein from live feeders helps them grow. But, she should still be given fresh greens daily. How has her appetite been? Since you've only had her a wk, she could be going through relocation stress but I think you'll see a big difference in her when you get the temps right, give her more live feeders and
bathe her. Her live food or greens should be dusted with calcium 5 days wk and with vitamins, the other 2 days a wk. You might want to start feeding her live food in the morning as that's when they usually have the biggest appetite.
I know this is a lot of info, but we're here to help you every step of the way. Please fill us in on what the tube UVB says as there are some tubes that don't produce enough and it's very important that you have a good one to prevent metabolic bone disease and other health concerns/problems. Is there anything you need more info on?