It isn't about her, or her composure. She could be the second coming of Christ and the republicans would cruxify her over herhaphazard voting record, her pending investigations, and her lack of experience. The PERSON of Hillary Clinton doesn't matter against the reality that the republicans have had 8 years to build an attack strategy, and it doesn't help her one bit that she made it easy for them.
All it takes is one 'flip flopper' or 'unprincipled' or 'bungler' or some other successful viral smear to sink her, mostly because she has a long history of all those and more.
No, the GOP has had some 25 years to sink her with everything from straight out made up shit to the exaggeration and gross mischaracterization of Whatever, to the occasionally plausible minor misdeed.
So either Hillary really isn't that guilty of anything or the GOP has the most incompetent ongoing legal team for the last quarter century. Either way, the GOP is fucked.
Ahhhh...but she has not met the Trumpinator. Seriously, there was a time I thought Trump did not have a wisp of chance - now I am not so sure. Trumpolini plays the role of a charismatic "strongman" nationalist better than anyone. Rather than apologizing for his wealth or behavior, he makes it his selling point - he presents himself as a modern "Captain of Industry", a heroic man who moves mountains and transforms cities...and, on the way, seduces a gaggle of pretty women.
Romney played within the modern cultural norms; the presumption being that white, rich, and male are triple sins that required him to show he was not guilty of all sorts of stereotyped sins. As such, if he was a bully in high school, or outsourced a job, or couldn't show that he had a binder full of jobs for women - gasp, the man is cretin. (To say nothing of what would have happened if he had spoken ill of a minority).
He accepted the modern moral ideal (often termed PC) of sensitive beta males berated and nuetered by alpha females and minorities. He conveyed weakness. And when caught insulting the 47 percent of the takers...he was doomed and apologetic.
Trump could never win with those rules. So he ignores man-made social convention and appeals to our human nature. He becomes the male patriarch, the the man of attainment and high status, the all-knowing man who makes his own destiny and remakes the world in his image. He will proudly say what he likes. And in doing so, millions follow our biological nature and respond to his arrogance and dominance as "high ranked".
And millions (not just lumpen proles) cannot help themselves and become memorized by someone who flaunts his wealth, his ignorance, his nasty 6th grade name-calling, and his comic timing into one message: I will takeover as your leader.
With a little message tweaking - I have little doubt he could win.