I was thinking that if the Hillary people knew days or a week or more before the election that she was in jeopardy they would have rushed her to do some campaigning in Ohio, Michigan, maybe Wisconsin, etc. in addition to PA.
If the Trump campaign had polls showing they could win those mid-west states you would think that the Hillary campaign saw it too.
OTOH - Maybe Hillary’s health condition was so bad that she couldn’t handle the strain of a heavy travel/campaign schedule.
I believe that was exactly the problem; she was sending out proxies because she has serious health issues. Just by being in Philly meant she knew PA was a toss-up; the media saw the same thing but kept it to themselves rather than state the obvious.