I scheduled a vet visit to get a fecal exam done yesterday. I wasn't able to get a fecal exam done, since I wasn't able to get a sample in time for my appointment, but I still took her back in for a follow up.
I got an x-ray done ($200), and the vet said all of her bones looked perfectly fine. However, he did suspect Nutritional Secondary Hyperparathyroidism. He recommended a "reptile guru" in the area, and sent the x-rays to him as well. I will have to wait another pay period before I can see this other vet. He also mentioned I should continue the Oxbow force feeding, and to do it every day to try to get her nutrition back up.
I'm still confused on how all of this started, but this is my best guess, since the first year of her life seemingly had no issues - maybe as she started to grow in size and I rearranged the items in the tank to accommodate her size, perhaps the basking spot got too far from the SolarGlo when I took the larger/taller decoration out. At the time, that was her all-in-one source for heat, UVB, and UAB. That's the only thing I can think of as to why she would no longer have the energy to hunt/eat and was always sleeping.
I've recently cut a hole in the mesh at the top of the tank, allowing the SolarGlo to be a couple inches lower in the tank, and also to allow more UVB in, since the mesh isn't there now to block any of it. I also added the ReptiSun 10.0 UVB to the tank. I'm hoping these 2 improvements to the lighting, along with the continual feeding and occasionally taking her outside, will start to have positive effects. Trying to stay optimistic :/ I will also see this "reptile guru" as soon as I can.