You know, with all this back and forth about her health, has anyone considered it doesn't matter. There is a reason there is a Vice Presidential candidate. There is a reason we have rules of succession when the President is ill/dies. In fact this was a major issue with McCain's candidacy, he was seen as old and with a reasonable chance of croaking or being temporarily incapacitated during his term, and his running mate was seen as at best woefully unqualified.
Now I'm no fan of Hillary, but if she were elected are people worried that Tim Kaine would not be able to handle the responsibilities of President in the event she were incapacitated for health reasons?