Hillary can't win, they are counting on Trump to lose.
Hillary doesn’t wear well in public so it makes sense for her to stay at home.
When she campaign, her poll numbers go down. She gets traction remaining invisible.
This is the best she can do.
Donald Trump needs to stay disciplined during his appearances. Hillary may be trying a "rope-a-dope" strategy in which she lays low and hopes for self inflicted wounds by Trump that will damage his candidacy. He needs to stay on message, and keep asking the media if they're okay with the fact that Hillary hasn't been holding any press conferences or granting them access to her.