She stared at him, blankly, face voice of any emotion. There really was no point in lying to him, but there was no reason why Hell would say he was contained, without everyone really believing it to be true. She could try for the way that had her saying she meant no offense. But maybe she did. Maybe she was just annoyed enough to. But she wouldn't risk giving anyone the satisfaction.
"That is the general belief in my world, yes." Over six hundred seals, but break sixty-six to and Lucifer walks free. It would make sense, in her opinion, for enough Angels, with God, to find away to lock him down there, and made it more than extremely difficult to have him walk free. Because not even every demon wanted him to walk.
As there was no reason to believe otherwise, and even those such as Alistair believed it to be true, why would she think otherwise? She had no reason to. Yes, he was Lucifer. Terribly, terribly powerful, but she didn't think there was absolutely no way for someone to weaken him. It wouldn't be easy, but it had to be possible. It was just the last thing she was interested in.