Show your dominance over her (sci-fi)

You arrive at the brig. There were many cells, but this level was empty, except for one. You knew you'd be coming here regularly and didn't wish to be interrupted. Hence all those empty cells. Far at the end she was. Kept safe behind a forcefield.
"Goodmorning, Doe." You say.
"Nothing good about it." Doe bit back at you.
She was feisty. Then again, what else would you expect from a redhead.
"You shouldn't be like that." You tell her. "You lost the battle, it is about time you accepted that."

She stared at you with her poison-green eye. The other one was hidden behind a black patch. "We'll see who accepts what when the rest of my fleet comes to liberate me. My vessels shall destroy your spaceships until there's nothing left of them but cosmic dust."
You lower your gaze to a control panel.
"Fact of the matter is, they aren't here right now."
You then press a button and a shock of electricity goes through Doe's cell.
Doe screamed and fell to the floor shuddering.
"So as long as they don't show up, I can do whatever I want."
Doe pushed herself slight up from the floor and gazed at you. Even with her hair in front of her eye, you could still see pure hatred in it.
"If I were you, I'd start behaving more friendly." You advise her.

She didn't say anything this time. The words she wanted to say would result in her getting shocked again, while the words that wouldn't get her shocked were those she refused to utter. It was best to remain silent.