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]
(..) as he must forgive you. There's no need to remain attached to a dying animal like me. What if I don't want to? Then I shall have to command you, being your King. My lady. Why can't you sleep? Are you afraid? No. (..)2017 TvShow: Vikings Title: On the Eve Season: 4 Episode 19
(..) itself is of the essence. They cannot bring such a force, on foot, or by boat, to Wessex within a week! Even so, the element of surprise is the most valuable asset. We... Father, since you've given me command, then let me exercise it. Father, I want to fight with you. As do I. And I won't risk the (..)2017 TvShow: Vikings Title: On the Eve Season: 4 Episode 19