I had assumed that she was indeed possessed by that woman, at least at some point between MK9/MKX.
Maybe being possessed granted her invulnerability to Quan Chi's dark magic. He could no longer hold her as a revenant because the woman takes control of her body and regains Jade's soul.
Grasping at straws here, but point is that there's definitely something fishy about Jade's current predicament.
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