The mention of Melva being a werewolf reminded her of Vance's conversation with his pack member, Davis, in the past that he had no intention of inviting her to join his pack. However, if she remembered correctly, Vance had not confirmed that he had no intention in turning her into a werewolf. What if he wanted her to become a werewolf and form her own pack to aid him in fights or something like that?
She had zero interest in becoming one of them after knowing the ill deeds they had been committing and what they were capable of doing. She was a future mate of a werewolf who had used to eat human flesh to gain power. That was certainly not a good deed in her eyes. They were predators who killed not only supernatural creatures but also humans as if it was a common thing to do in their daily lives.