Coach, you know what's going on, right?
Hliary believes it'd do MORE damage to respond to it, than to just ignore it. Trump bragged that he knows the system because he played it for years - so there aren't a huge number of people who are "outraged" that hilary traded cash for face time. It's waht trump played along with for years.
Hilary knows she gives this thing legs by addressing it. Right now, the GOP is screaming bout her health, benghazi, emailgate, hacking... 50 things, so each of them only gets 2% impact. The GOP message is so shredded. They SHOULD all be hammering the play for pay. Instead, you have Rudy telling people to google hilary health, you have Katrina handing out broscience diagnosis, you have trump ranting about a secret affair between mika and morning joe...
Trump's doing this on purpose, coach
so to your point - hilary believes she'll win anyway, so why dignify the accusations?