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]
(..) Understand? You were too sick to make a decision. I got a go-ahead from Neri and Connie. Connie? It was the right decision, Uncle Mike. It was the wrong decision. I command this family! Right or wrong... ...it was not what I wanted! Do you understand? Yes. Come on, Michael. (..)1990 The Godfather Part III