It could be premolt, it could not be, it could be too big of an enclosure as well. Really hard for us to say anything, definitive for you.she has completely blocked the entrance to her tunnel. Is she molting?
My tarantula likes to burrow, he's an aphonopelma semani. He often blocks the entrance off to his burrow, and creates some pretty elaborate tunnels, and made his own entrance, just make sure there are no heavy objects above ground so it doesnt collapse their tunnels. When in pre molt, he can hide while refusing food for a couple months or so at a time. He hides underground a lot, but comes out in the open a lot tooSo I have a Guatemalan tiger rump and I've never had a burrowing t before. So she has completely blocked the entrance to her tunnel. Is she molting?