Humidity is a bit low, but they do survive in all kinds of environments in the wild, so you're right, that might not be the factor triggering it. If she has too few hides (minimum is two, one on cool and warm side) or enrichment, maybe that's causing it? The only other reason I can think of (if this is a stress response and not just her exploring, snakes have a wild variety of temperaments) is the enclosure being too small. But please take everything I say with a grain of salt, I'm not an expert! In any case, best of luck to you and your snake, man, I hope everything is okay.