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]
(..) And the Dead keep it. The way is shut. Now you must die. I summon you to fulfill your oath. None but the king of Gondor may command me. That line was broken. It has been remade. Fight for us... ...and regain your honor. What say you? (..)2003 The Lord of the Rings: The Return of the King
(..) ...my kinsman and me. - He fell defending us from many foes. - Pippin. I offer you my service, such as it is... ...in payment of this debt. This is my first command to you. How did you escape and my son did not... ...so mighty a man as he was? The mightiest man may be slain by one arrow... (..)2003 The Lord of the Rings: The Return of the King