Wait and see.
If Bush looks beatable at all, Hillary HAS to run. The alternative is having to wait another eight years for her shot if the Democratic candidate wins. She has to run, or hope that Bush wins. What choice do you think she will make?
Polls show Hillary as a much more popular contender with Democrats than any other candidate.
Consolation prize: someone like Clark picks her for VP, although I'm sure she'd prefer it the other way around.