Fear is for the weak.
Her father had taught her that. Fear, in the moment of combat -- in the heat of action, the moment before the kill -- would make one weak. Hesitation would stop a blade faster than any plate or magic. If she stopped to be cerebral; if she hesitated on her course of action, then she would be lost. The Light only reinforced this teaching: it, too, required absolute certainty. Eleeria had never felt the sudden chill of her holy magic pulling away from her, and she was not interested in ever seeing it disappear. So, she made herself believe. Every choice, every difficult decision, backed up with mental certainty. She did not act until she was certain of purpose.
She had no doubts about what she had done.