The lady was completely hysterical. Apparently, she was faking the indifference, just as Su Bai had guessed.
Su Bai had never believed her attitude or calmness or what she said about not wanting others to become the same ghost-like thing like her. If he still believed her crap, he would have lived more than twenty years for nothing.
Her faked generosity was actually so weak that it wouldn't withstand a single blow.
When others were luckier than her, when others were not as miserable as she was, or when others were doing much better than she did, her fake nature would come off immediately, revealing her hysterical envy and unwillingness. And such a person would look more evil than those who were bad from the beginning.
However, an assassin would never give full play to her potential when she was filled with hatred and other negative emotions. She just threw herself at Su Bai, regardless of everything. Therefore, Su Bai was even less scared since the lady was just a total loser.