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]
(..) Well, thank you. We'll just go. Go? l think not. My sons and daughters do not harm Hagrid on my command. But l cannot deny them fresh meat. . . . . .when it wanders so willingly into our midst. Goodbye, friend of Hagrid. (..)2002 Harry Potter and the Chamber of Secrets