The look on her face is a mix of relief and confusion. It isn't that she doesn't appreciate what he's offering, because she does. The idea of being around other wolves, wolves who will be able to help her deal with this, is an important one and she wants to accept his offer, that olive branch, for what it is, but she feels he need to ask more first.

"You don't know me." Obviously. "Why help me?"

She's waiting for the other shoe to drop, the catch that will explain it all. Nothing comes for free in this world or any other, and Hales fall into traps like this all too easily. She doesn't want to accept help and wind up selling her soul, not that she thinks Alek would ask that of her.