I’ve been using photoshop every day since 1991 and I don’t see anything funny about the photo (given the low resolution).
Put an exposure layer on and run up the gamma. I see no mismatch - as you would expect in a composite.
Put a hue/saturation on and run up the saturation. You will see her previously invisible reflection in the floor.
As others have pointed out, her hand in no darker that grandaddy’s arm in shadow.
I say this is a wild goose chase.
I agree with you.