The poll means nothing. While the DNC was solidly in her corner on the last election cycle, they will run from her next election cycle. So even if she ran she would not win the nomination in the next upcoming presidential election cycle.
I agree, with you, I usually have little faith in “Online Polls” but, I must admit, the Drudge Report “Online Polls” during the 2016 primary and general election pretty much showed the winning trend that trump was on.