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]
(..) You're Lord Commander. Your decision. You have many enemies in Castle Black. Have you considered sending Alliser Thorne elsewhere? Give him command of Eastwach-by-the-Sea. I heard it was best to keep your enemies close. Whoever said that didn't have many enemies. He sees something in you. (..)2015 TvShow: Game of Thrones Title: High Sparrow Season: 5 Episode 3
(..) I'd like to speak alone. Ollie is my steward now, as I was Lord Commander Mormont's. I want him to attend my meetings, to learn from men with experience. One day, he might command. Very well. Have you considered my offer? I have. And I thank you for it. You do me great honor. (..)2015 TvShow: Game of Thrones Title: High Sparrow Season: 5 Episode 3