My geuss is the very beginnings of belly rot. If you put her onto the newspaper substrate and she sheds pretty soon(which the pink on the rest of the belly seems to indicate very soon) I'll bet it disappears with the shed.
If it is indeed belly rot, it looks like it's caught extremely early and should be fine, just watch it for after the shed. I would offer a humid hide for the shedding so the rest of the newspaper can be nice and dry.
Good luck.
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