When a snake insists on going under the substrate to hide, it probably means their hides are too "tall" inside...lacking a snug feeling (aka "back pressure).
You can often improve such hides by loosely crumpling a paper towel or two & putting them inside, so they feel more closed-in. All snakes prefer hides that
have only one doorway (not open at either end), not too big of a doorway, and where the hide feels like a cave that doesn't have enough room for a predator
to sneak in with them.
For the moment, I'd leave her be...it would only stress her to be pulled out from her hiding place. It's unusual for a BP to hide under the substrate...it's more
typical of king snakes & others.
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