[Moved from General to Behavior (until determined that she's ready to lay eggs)]
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How old is she?
Is she rubbing more than scratching/digging? If so, then it's because she's getting ready to shed. If she's scratching at the floor as if she's trying to dig to China, then it could be attributed to her wanting/needing to lay.
Have you sexed your beardie? You can do that simply by lifting up her tail until you can see her vent, then check the area right above it (on the tail part) for either 1 bump (girl) or 2 (boy).