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If it were me, these are the steps I would take.
First - put an isolating layer of retouch varnish on it. That way, if you mess up what you're doing, you can easily remove the additional paint without disturbing what you've already done. Let that dry.
Oil out the painting (put a whisper-thin layer of linseed oil over it, then wipe it off). Then mix your flesh tones in shadow, and paint into the wet surface.
You might find that you can just repaint the eye area - or it might be that you'll have to revisit the whole shadow side of her face. I guess it depends on how well you can recreate the flesh tones in shadow.
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