Thanks for the report QPF.
Could just be the end of the season or a momentary moment, when you caught/saw her. Remember, it wasn't a photo op.
She could also still be recovering from her cold as well (though I agree, she does look quite solemn in the 2012 Fed Cup photos). So maybe it's not as bad as it seemed altogether.
As far as the Kiss: I know it was Kiss Cam and all. However, if I was Adam, I'm not sure I would have liked that. But then again: What can he really say or do about it?