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 tear to pieces that great bond which keeps me pale. MACBETH: Get up! Tonight we hold a solemn supper, sir, and I'll request your presence. Let Your Highness command upon me to the which my duties are, with a most indissoluble tie, forever knit. Ride you this afternoon? Ay, my good Lord. (..)2015 Macbeth
(..) Good morrow, noble sir. Good morrow, both. Is the King stirring, worthy Thane? - The King, is he stirring? - Not yet. He did command me to call timely on him. I have almost slipped the hour. I'll bring you to him. I'll make so bold to call. - Goes the King hence today? - He does; he did appoint so. (..)2015 Macbeth