Its too late for her or anyone else to disassociate themselves from him. The election is 13 months away. Every time she opens her mouth all someone has to say is "failed policies of Obama ADMINISTRATION" and keep on repeating, ad nauseum. Use the leftist tactics against them.
She failed to break away from Zero when she would have had a chance to distance herself from his policies. To do so now, she'd appear as a mere opportunist. Of course, to leftists that would not matter. To liberals, if Zero dropped out, ANYBODY who ran as a DEMOCRAT would be OK. Even if Vladimir Putin ran with Kim Jong Il as his VP.
Plugs Biden has publicly stated that the Obama Administration owns the economy's problem.