She’s a ‘hubrist’ and she’s damned good at it.
She's in good company.....
"What are some of the greatest examples of hubris in real life?"
All well and good; most tin pot dictators surround themselves with yes-men who offer continual praise, often ramping up from one point in time to the next. This inevitably leads to massive overconfidence, thus committing to courses of action which are bound to bring down disaster. Benito Mussolini was a sublime example, and of course including Adolf Hitler.