We see that ALL the time, especially during her interactions with Riona. Those really make it clear the most, but there are tons of other scenes as well. Just look up what actual people that are narcissistic psychopaths do and how they behave towards other people: trying to manipulate and control people, abusing them (often only for their own amusement), overestimating their own abilities, denying their own responsibilities for failures, underestimating dangers, constant lying, it really is all there, if you want to see it.
Again: Great job by DPC for writing a character like that almost by the book.