I think you're exactly right. The only thing I'd add is that I think some of the steps she'd take would make it impossible, as a practical matter, for anyone other than a Democrat to win the Presidency. So while it won't be a collapse, it will be a slow, inevitable, irreversible decline.
That's possible, assuming no real crises occur during her time in office.
However, if the economic and geopolitical situations are as unstable as I believe them to be, I could easily see a crisis coming to a head, and Hillary Clinton being unable to deal with it or, more likely, dealing with it in a way that makes it worse. In that case, all bets are off.