The last time her ability was triggered was when she learnt that the body she occupied was her adoptive father's daughter. When she learnt what Duncarabian did, she couldn't hold it in. She wanted to get away as soon as possible. In her haste, her ability engulfed the whole city and broke every string that protected it from turning into an Empire of death.
She always acted based on her speculations. She kept away from people, from others, and kept to herself because she knew that everyone who knew her was affected by her. She pushed everyone away. Everyone died. Duncarabian told her she was a kind person, over and over again, as if he was trying to reassure her, or maybe comfort her. She didn't know which the truth was.