Deremensis have an unnerving habit of refusing to lay eggs and dying. Obviously, not all do this (my profile pic attests to this), but many deremensis hold back for some reason. I personally am wondering if there is an environmental cue they are not getting, but I have not cracked this.
On one of my females I started oxytocin with little success and a necropsy found her egg laying tube was damaged. One data point.
As for your situation, I would suggest taking her to the best vet you can and induce egg laying. If she is at the bottom of the cage it is as good of a sign that she is ready that you are going to get. I have been at this point with a number of gravid deremensis and, in my experience, overt signs of distress come when there is little else you can do besides watch her die.
I advise to take her in and get egg laying induced. But realize you are getting this opinion from someone who has only seen some pictures and read your words. Take this opinion and any others you get and make your own decision. My second suggestion, though, is to make that decision now while you still have a decision to make. Unfortunately, in this case, you will have to make a decision before conclusive data is available to you.