Just wait it out. She could be down there going through the later parts of her molt process, or recovering from a molt. Disturbing her now could result in her death because you don't know where she is.
T's are not in the habit of diggin their own graves. But if in a few more weeks you get overly worried you can gently unearth her and see what's going on.
So you can't see her at all from any angle? I really think you will be fine waiting, she should open it up when she is good and ready.
How big is she?