My New setup and humidity trouble

[BP99]

My ambient temps around 80, I have accurate thermometer hygromether , it shows hot side to be around 91 most of the time, on a cool side though, since it is standing right in the far away corner most of the time it shows 77, when I pull it towards the hide under the lamp, it is about 80 or so. I also have infrared temp gun, not sure how accurate it is, but it shows temps near the hide on the cool side to be around 82 and hot side 89-92 .
I got some hides from reptile basics, small and medium, unfortunately I think my snake already outgrown small ones, it barely fits in it, and the medium sizes are huge, like 4 of the small ones in one.
I only had my ball python for 3 weeks, I got it for kids for Christmas, so I never have seen it shed, but I assume it might have problems, with humidity being around 40% or so.
I do have 2 water dishes in the tank, one in the middle, one in the left front corner. I did buy some moss yesterday, so if I see my snake shedding I will add it in, or just put the medium hide somewhere in the middle with moss in it.
I'm new to snakes, so I'm worried about every little thing, I want it to be healthy and thrive in the environment that I have set up for it.
It hasn't pooped for 2 weeks now, so I'm kind of worried, and she usually very active at night, but today she was just laying most of the day and the night on the hot side and still is even now with her head outside the hide.
I did add bunch of fake plants yesterday to her enclosure, to provide more places to hide, I hope it is not causing to much stress.
Is it possible, that she hasn't pooped because the feeder was to small for her ?