She has a reputation that 'commands' attention/respect. [=people give her respect/attention because of her reputation]
In the United States, the President as the commander in chief is at the head of the military 'chain of command'.
She seems to be 'in (full) command of' the situation. [=she seems to have complete control of the situation]
(..) most honest way to be. Not in the face of a great heathen army that are come to destroy us. That is why I have placed you in command of our armies. I trust you completely. It's why I always used you. You loved 'thelstan. Right? You love Ragnar Lo'br'k. (..)2017 TvShow: Vikings Title: Revenge Season: 4 Episode 18