Putin and Assad will just run proxy campaigns for her.
ISIS will run a proxy campaign for her opponents.
I've never gotten why her Syria trip is trashed as a bad move.
If ISIS (or any other rebels) win, she can play Obama vs. Iraq while pointing at the resulting disaster AND paint herself as a realist on foreign policy.
If Assad wins she can say convincingly that he was better than the people he was fighting, play the realist and "I was right" cards. (Extra points here if disgruntled Islamic radicals pull off a major terror attack on the West/US in the meantime.)
If it's still going on, she can point out that she would have ended the conflict long ago if she were in charge.
Among anyone at all likely to vote for her, there is no downside.