Regarding the hides, there is the tree bark on the right, where she spends most of her time, because she can wedge herself in it seems to be the best size for her. There is also a hollow of tube of wood just to the left of the fern, which she has been in a few times, but prefers less because it has holes in it. The last hide is nearly impossible to see in my pic (apologies), but it's behind the leftmost plant and is a plastic hide with two entrances and is under the heat lamp. She has used this one some as well.
I agree regarding lack of cover. I will add more wood for her to climb if she wants, as well as more plants. I have been googling other options as well. I will also cover the back and sides, although not sure what substance is best.
Regarding feeding, she has been raised on f/t mice. The last mouse I gave her was between 20-30 grams, and not larger than her body at the thickest spot. I thaw in a bowl of warm, hot water, then try to feed her in the tank, using tongs. The last time she ate, she would not take from the tongs, so I left it on top of a hide and it was gone in the morning. I generally try to feed at night when she would be active, but since her last feeding she has been hiding more than moving. I check at night and she rarely comes out of her hide, which is why I assumed she is stressed.