Either she's denying it, or she doesn't know. And knowing Janie as he does, Phoenix suspects it's stubborn denial.

"Here..." He rummages for the other six vials of antitoxin he kept for himself and Janie. Then hands one of the vials to her. "Ylaia had her laboratory manufacture this some time ago. The Hell war wiped out the lab, but the vault was intact... I think we both know you could use some."

He's calm, and seems very far from his old belligerent self.