Silena had backed away once the healers made it to their queen's side to help her. Looking to the scene between her father and Loki, Silena took notice of Loki's posture. This wasn't guilt. If it was guilt, Silena was more sure that there would be more than just stand there, she was sure that someone would beg and plead to be seen as something as guilt. This she saw a Loki before. Fear. Raw traumatizing fear. And her father was doing nothing but making it worse and making a scene beyond what it should possibly be. She went to her father to try and calm him down. 

"Father, father wait!!" She tried to get infront of him, knowing that he would never try to harm her. "Please calm yourself father! Why are you after Loki? What has he done?" She asks him, hoping for answers.