Not climbing her trees as much would be a good sign, assuming she was climbing during the day before. Being overly active, climbing, and searching when it's still daytime usually means an unsettled and insecure ball python. It's normal for them to become active at night to "hunt" for food, but even then, not all do.
I'd add some more cover for her, like big leafy vines. The 20gal is too big and open for a hatchling her size, unless you add a ton of cover and stuff for her to hide in. (I assume hatchling if she's on rat fuzzies) https://www.amazon.com/Flukers-51015...s=reptile+vine
The reason being, she might be choosing the cold hide because it's maybe darker or somehow feels more secure to her than the warm hide. So I'd increase the comfort and cover all around the cage and see if it helps.
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