Locked in the Dungeon.

News has spread far and wide about the death of the vampire king, who is Xavier's father. After his burial, the next important ceremony coming up was Xavier's coronation as the new king. He was an only child, so there was no need whatsoever to fight over the throne with anyone. 

Invitation was sent to other kingdoms, just like the laws of the land. The werewolf Kingdom was not exempted, and since Xavier's late father also attended Arthur's coronation, it was only right for Arthur to also attend Xavier's coronation. 

The morning of that day, Xavier had instructed one of his male servants to lock Winifred up in their dungeon. Their dungeon was behind the palace hall, but it was far from it that if anyone made noise in the dungeon, it would be hard for people outside to hear the noise. That was his aim, he didn't want any reason for anyone to claim her back, he had a feeling that Arthur might be looking for his dearest slave afterall.