Well, not to be facetious dudeabides, but it's far more likely that she will use Obama than Jeb will use Dubya.
And yes. A campaign that disendorses the sitting incumbent of the same party starts behind off the bat. obama's approvals (barring some sort of shock event) should be decent (single digits net approval probably), so she would be crazy to not run with Obama, especially where he plays well (student areas, Black communities. Might as well make the most of some "incumbency" advantage.
I do agree with that. Jeb won't be using W, despite the fact W was a far better President than Obama.
There's good reason to not use Dubya. In fact plenty of reason to not use Dubya. Anywhere that Dubya goes there will be noisy, disruptive protests. There will be placards that read things like "W stands for WAR CRIMINAL". He will of course be linked to the economic meltdown of 2007-2009,
FoX News rarely mentions him.