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]
(..) The place to which we journey tonight is extremely dangerous. I promise you for the company of me and I stand by that promise. But there's one condition. You must obey every command I give you without question. Yes, sir. You do understand what I'm saying. Should I tell you to hide, (..)2009 Harry Potter and the Half-Blood Prince