I'm new to snakes, however, I very recently got a baby female ball python. For the first week, she didn't go in either of her hides. She usually curled up on top of the plants, just under the terrariums screen or in the corner, on top of the substrate. It wasn't until after I fed her that she went into her warm hide. Since then, she spends most of the daylight hours there.

I had a little trouble getting her to feed the first time (I feed frozen/thawed). So, I took a needle and punctured the cranium of the mouse. After that, she took the hopper mouse within less than a minute.

Good luck.