I disagree with several points you make, I'll try to elaborate point by point.
"She is the commander of armies, yet she acts nothing like such". The show tells that we only see the backend of her being a commander. After 100's of years of chasing an enemy you never find, few still followed her, and the final group fell apart after the snowtroll. This is frustrating as hell for her, because she KNOWS the evil is still out there. How? Literally magic, she's well established to have visions.
It is then quite vexing that others keep asking for proof when you yourself are literally the witness. She overplays her position in Numenor, but at this point in time I think humanity felt insignificant to the elves, as is also implied in the southlands. Imagine standing in front of a court of toddlers, blocking you from what you know you need to do, NOW.