Evilyn waited until Victor was gone completely. Until no trace of his presence could be found before running off to report to Zane over what she had seen. Every step of the way, she was cautious to make sure she wasn't followed. But in the end she made it back to the Mansion where Zane and the others were lying it wait without leaving a trace.
Victor seldom concerned himself with the affairs of his siblings. Especially those who were much weaker than himself. However, had Evilyn been any of his other siblings he would have stopped and interrogated them why they were in his domain without paying proper respect.
But to those rare Horde Kings who were spectral in nature. They had their own rules, which they followed. Ghostly Horde Kings were almost always nomadic. They came and went wherever they were damn well pleased, no matter who was in charge of them.