But why did the wife decide to hold a cult orgy and/or participate in something like that in the castle, the center of the Count's kingdom, where she knew her husband would be coming back to? It could be assumed that she just stopped caring at some point. I do wonder if she was simply brainwashed by that cult to hit the Count where it hurts, or if she betrayed the Count on her own accord.
Edit: Come to think of it, it's kind of unbelievable how they snuck that big statue inside the throne room like that.