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]
(..) - Do it, Robbie. - What? - You're not his master. Do it. It's not him. Look at that. He's waiting for your command. Maybe my dog killed Dr. Elliot, but that doesn't mean I made him do it. Ripley's a good dog. He wouldn't attack unless he was ordered. (..)2008 TvShow: Bones Title: The Finger in the Nest Season: 4 Episode 3