Does anyone have anything to add, or is there any point where I didn't get it right?
you're missing the major point: money. she has access to every major Dem donor. she could run a few hundred million dollar primary (perhaps outspending any upstart progressive like Warren or Sanders that dares to challenge her divine ordinance by ratios approaching 20:1). she could also get to $1.5-$2B for the general (Obama ended up pulling in $1.1B in 2012).
and none of those numbers include the shady super PACS, which most likely account for more money than the campaigns proper.