Or she could prove them wrong by running. At this point either she runs, endorses someone soon, or looks like an opportunist guaranteed. If she winds up not running or endorsing, she winds up looking like an opportunist because she has spent a lot of time looking like she is going to run for President. I mean, she’s in Iowa for Pete’s sake.
All of her negatives can be overcome by a strong campaign. Her negatives are a result of perceived negative character. If she runs a strong campaign that builds up the perception of her character and her experience, then there is no stopping her from winning the nomination and probably the White House.
Actually, if she doesn't run, she has spent the time and effort (read: money) of a sizeable fraction of the MSM in attracting their speculation and vitriol. At a minimum, she has been drawing fire away from the committed candidates.