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]
(..) those was some fairly savage preadolescent jews. No, we were annihilated by our own incompetence and the inability of some people to follow the chain of command. Sheldon, let it go! No, I want to talk about the fact that Wolowitz shot me in the ck. I shot you for good reason. (..)2007 TvShow: The Big Bang Theory Title: The Middle Earth Paradigm Season: 1 Episode 6