Hillary can win simply because she's very likely to be the Democratic nominee. John Kerry had to be the worst candidate since McGovern or Mondale, and he came this close to winning it all. By just having her name on the general election ballot gives her a chance at winning.
How much of a chance? Depends on who the Republicans run. Depends on what type of candidate Hillary turns out to be. I imagine Hillary will be a lousy candidate, because she's unlikeable. However, that'll be evened out by the media propaganda machine behind her. If the GOP runs a weak candidate, or there's a 3rd party spolier in there......I don't like to think about it.
The only way she could receive the Democratic Presidential nomination in the same way is every other big name Democrat was willing to set aside their own ambitions for the White House and just give it to her (which I believe there's as much chance of as Hillary being Playboy's Miss September). Otherwise she's going to have to actually campaign...something she has never done and hates.