From your photo it looks like a second hide migh be in order. Generally speaking 2 hides the same one hot one cold. I also personally think that in a set up similar to yours a touch of cover might be good too like a fake plant perhaps.

This aside if she is eating and regulating and sheds fine and has been doing so for a while there isn't really a problem. Ball pythons are fairly communicative with issues they stop eating. Now what that issue is is another story...

Climbing, in its self is no problem the magority of mine will one more than the others. There are written accounts of in Togo finding them in low tree branches (P. De Vosjoli). I think that a snake that is hiding 100% of the time is not normal either I expect to see mine every now and again usually in the late night but sometimes in the early morning (about 2 hours before sunrise) not everyday but some days (usually before feeding day they are all out )

The gauages you have in the photo, are they humidor gauges? I have been on a personal quest for accuracy lately (OCD) and in a post Sunday I think someone recommended them after some poking around and reading specs I'd actually say a decent humidor analogue guage is many time superior to cheap digital ones! They can be calibrated and set to correct. The cheap humidor digitals also have a finer degree of arror than cheap digital (1% humidy up or down and 1ºF up or down) When you look at regular digital 5% (some are 10%) and 2ºF (some are 2ºC which is 5.4º!!!) up or down allowable by the manufacturer. If they are humidor gauages they are likely better than most digitals. (don't take my say so check your specs!)