Well, Larisa subtly tried to hint that Ghost was definitely Mafia, and would last at least two or three days. Then, during the daytime vote, she was exposed with two votes against her. From this, I concluded that she was definitely testing Ghost. Where did she get such confidence that we would modkill the Mafia?

Added 1 minute ago
Of course, while her role wasn't revealed, it would have been foolish to trust only her words. And then, everything seemed to fall into place.