She's going into shed, so now worries there. I would add a humid hide for the next week or so (or permanently), since your humidity is a little on the low side for a shed cycle (fine for regular ambient, though). You need to find a better bulb or heating system for at night (75W red IR bulb, not just a colored light bulb), because a 10 degree drop is really extreme. Oh, and take the tree out so you can put two hides in there. She needs to be able to choose a temp, not be forced to sit in the middle to feel secure. She could also be more active if whe's hungry - what are you feeding her and how often?