She knows she's a negative and thus is keeping a low profile AND keeping her trap shut. In that, at least, she is smarter than John Kerry.
Smarter than John Kerry? There's faint praise if I ever heard it. Hopefully they've set the bar a little higher than that.
She knows politics (unfortunately). When you're ahead in the final weeks, stay out of sight and control all your soundbites. Reveal only that which highlights your opponents weaknesses (in your view, at least)