Kryptonite is the first thing to cross her mind. To some extent, she can't help it. The rock has become such a forbidden object, painted as such evil, that some part of her mind always keeps the idea close at hand. By making it ultimately forbidden, they have made it something she will forever want by sheer rebellion alone. That they then terrorize her when they're evil or that Jor-El's here talking about being afraid of accidentally killing someone.. well, it doesn't help.

But she knows better. Hayley doesn't want to hurt Jor-El. The rock is a comfort to her, another protection like lying or refusing to make friends, but that's all changing now. She wants it to, in some ways, and appreciates the benefits that come with it. It's hard to learn though, hard to truly believe that she doesn't need a Plan B and exit strategies.

"Why are you telling me?" She replies coldly. The girl doesn't consciously recognize his sudden emotion, however feigned it might be, but she responds to it at an unconscious level. "And you need to sit down."

Hayley thought she was getting better. Seeing him stand there makes her nervous all over again. Afraid.