He might have made a peace treaty with her, but it doesn't mean anything. At the end of the day, they still don't trust each other. Besides, she doesn't have much of a choice. She is trapped in this place, and his offer might offer an opportunity for her to escape, which can be the real reason she decides to agree to his terms under the pretense of a temporary agreement.
They are only using each other for their goals. She gets what she wants while he pursues his goals.
She was still in manacles; her hair was matted and filthy, like it hadn't been washed in days. Well, indeed, she hasn't washed in a while thanks to him.
She watched him with wary eyes as she inquired, "Why do you want to go to Nightfall? They aren't exactly a place for a vampire to visit?"
