The place looks just like she left it, but it's vibrating as if affected by a low-scale constant earthquake.

Well. That's a thing that's happening.

It is! There are various things falling from the sky but most of them are going straight for the Death Pits.

Any danger of her perch being disturbed?

Yeah, probably eventually. The walls are shaking rather more and some metal beams are being moved and the whole structure is slowly starting to shift.

Right. Ways out?

Well she's in a sort of corridor: to one side there's the Death Pits and to the other there's a wall with a square hole on it and a large-ish square metal grate.

She can probably clamber up to the grate.

She can!

And then through to the hall.

"Oh good. You're alive. I was starting to wonder. Please do proceed."

The corridor she's in is more like a proper one, and it turns right with some debris she can squeeze past.

"Fun as that sounds, no."

The room shakes again.

She feels more secure here and this doesn't inspire her to move.

The various plates on the wall every now and then jiggle and twitch, but nothing more happens for a few minutes.

Then a claw descends from a hole in the ceiling to grab some debris out of the way.

She's ready if it comes for her.

It doesn't. It just seems to harmlessly rearrange and clean stuff.

Uh huh.

Cleaning cleaning cleaning and rearranging!

She's not going to sleep as long as it's there.

It's not going to be there long—as soon as it's removed the biggest pieces of debris the rest can be swept off with panels.

How long does that take?

At this rate it's probably going to take a couple more hours for it to be pristine.

Back to sleep, then.

If she leaves her motion detectors active they'll be detecting a lot of motion over the next few hours.