Clinton needs to hammer home TrumpMiller's many deep flaws, not his politics. Make sure that everyone in America knows he's a pathological liar, concerned only with himself, and has a long history of making bad decisions.
Forget "Dangerous Donald". What the Clinton campaign wants everyone repeating is Terrible Treacherous Trump, who continually makes mistakes, then lies about it while stabbing his partners in the back to make a buck for himself.
While she does need to make sure that his previous statements, positions, and actions stick to him like stinky glue, her campaign shouldn't make them the core of their anti-Trump position. (They can use his attempts to redefine himself against him. Every time he contradicts himself, he's just proving that he's a liar. A "there you go again" sort of attack, but sustained over months.
Trying to win against him on politics as usual is a game for suckers. It's how he wants to spend the next six months. What Trump doesn't want to be doing is spending the rest of the election trying to convince people that he's not just a con-artist with an ego bigger than his hair.
Everything you mention could also be used by Trump against Hillary:
She is a pathological liar.
She is concerned only with her entitlement to the presidency.
She makes terrible decisions; in her official capacities, her campaign, and her personal life.
Donald Trump is a pathological liar, every fact check organization finds that Hillary Clinton either mostly tells the truth or is no more dishonest than the average politician (and probably the average person as well.)
She may be concerned with her entitlement to the Presidency, but she is also genuinely extremely knowledgeable of issues and how government works and, though she flip flops like nearly all politicians (Bernie Sanders is a rare case of being mostly 100% consistent), she also has a rather clear philosophy that places her as a centrist to liberal leaning Democrat on most issues.
Donald Trump's ignorance of the issues is breathtaking for a Presidential nominee of one of the two main parties, and, although many political writers have claimed that his philosophy is that of a 'working class Republican,' if you read what he actually says, to the degree that what he says is more than vague and meaningless babble or pablum, it's clear his philosophy is completely incoherent.
I will leave it up to everybody to decide for themselves regarding her decision making and judgement.
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