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]
(..) is an opportunity. What other brilliant insights have you brought me today? After the Lannisters and the Starks, the Tyrells command the largest host. Their lands are the most fertile in the Seven Kingdoms, - feeding horses and soldiers. - Yes, yes, yes. (..)2012 TvShow: Game of Thrones Title: The Old Gods and the New Season: 2 Episode 6