If you see her and there's movement leave her alone. Some hide or at least partially cover the burrow opening. My 5" P. muticus has two openings the size of a nickel, but I see her move around. Been this way for the past 3 months, I rarely see her on top of the substrate.
They dig down, burrow collapses, they dig out. I don't intervene unless there is a "foul" odor, indicating death.
Only time I dig one out is for a rehouse and then very slow and carefully.
And, as stated above, may be in premolt and should not be offered prey until it surfaces.