Kijani wasn't surprised that she was being tested. The Emperor was no fool. One didn't hold onto power without being able to scrutinize those around them. That he'd ask her to go straight to murder was surprising. She wasn't quite sure that she was capable of it.

Then again - 

He wanted them dead. That didn't mean her hand had to be holding the gun.

She shut her eyes and breathed slow. She reached deep within herself, thinking about who she was. The parts of herself she disliked,the parts she buried, what she pushed down to be more agreeable, whether or not they were good or bad. She inhaled, and grasped her flaws and fears and wants by the neck.

She exhaled and drew them up from the dark.

When she spoke, there was a level of icy derision in her tone. It was Kijani's voice, but not. "...You must think me a fool, Emperor Palpatine. Kill them? Me?" She snorted derisively."A queen does not sully her hands with such filthy work." Slowly, she approached the troopers. They did not move - even though he must have heard the Emperor's command. 

Kijani stared each man in the eyes, watching them until she was sure that she had their attention. And then she started to speak. 

"Do you see those other three men? They are not your friends." Her voice was a but a whisper. "They walk beside you, they work with you. They mock you when your back is turned. When you close your eyes, they take from you what is yours." The Emperor could probably feel what was underneath her words. The Force, soft and subtle as a spider's thread, weaving her lies with Truth. It was quite similar to what Jedi used for persuasion. But if the mind trick was a sword, what Kijani was doing was a needle. Nudging and pushing, just so. It was all very plausible, wasn't it? Just inside the edge of what could be. It was a lie - or was it? 

"You have been betrayed. They want your position, and your glory. They want everything that is yours. Everything that should be yours." The effect was almost invisible, but each trooper's eyes darted to the others who had been his squadmates. All their gazes laced with paranoia and doubt. They shifted, discomfort in their bearing. 

"...you know, just as well as I, that the moment you turn your back, they will kill you." She lifted her head, and stared each man in the face. And whispered one last word. "Unless..."

Her job complete, she stepped back. 

A Queen did not kill. 

No, there were people to do that for her.