Kacie had been one of the very first to notice the change since she was someone who had seen how obsessed the girl had previously been with fighting and strength and the determined look she had had in the past. Kacie could tell that something had changed in Shiranui for her to be acting like that.
The more she looked the more she felt that the change had something to do with Zavier as Shiranui would look at Zavier from time to time and the smile on her face would mellow out even further. Even though Zavier didn't bother to look at Shiranui, Kacie still found him suspicious.
Shiranui had been constantly walking by Zavier's side and would act very intimate with Zavier whenever he asked her a question.