Her parents were killed by the Ecleteon werewolves that caused their
Kingdom’s fall. She vowed for her revenge and to reclaim their kingdom.

To have successful revenge, she needs to gain power again, hence she volunteered herself to be the wife of the Glodeous’ Vampire King when she learned that he was looking for one.

Would her marriage to the Vampire King fave for the success of her revenge against the Ecleteon Werewolves or be her complete downfall?

How about the prophecy? Would her marriage to the Vampire King eventually fulfill the prophecy?