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]
(..) Ed! Goddamn it, stop it! Understand this! We are now fighting for her soul! "In the name of Jesus Christ, the saints and all the angels... ...I command you to reveal yourself!" Roger, help me! Put her down! Put her down! Put her down! Carolyn! (..)2013 The Conjuring