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 really have your mother's eyes. You've fought valiantly, but in vain... I do not wish this. Every drop of magical blood spilled is a terrible waste. I, therefore command my forces to retreat... In their absence, dispose your dead with dignity, Harry Potter, (..)2011 Harry Potter and the Deathly Hallows: Part 2