When he said her last name as if he knew her, Selina didn't even flinch. Sam had put her through the initial shock of others knowing who she was that she didn't know existed. It didn't surprise her at all that Bane knew her name. It wouldn't surprise her either if he knew more about her than she would've liked, as well.
The fact that she knew no one could be to her advantage, or to her disadvantage. How ever she chose to make it work. It was possible that anyone that knew her and her skills could encourage her in just about any way they saw fit. She was known to swap sides without notice if the benefit was to her liking. As of now, she had no side and no claim to anything or anyone.
She nodded at Bane and relaxed slightly, "It's okay. I should be the one apologizing to you, I think. You know me, and I have no idea who you are." Or what he was capable of. "Don't let me keep you from what you were looking for or doing before I interrupted you."
She wasnt going to stand in anyone's way, not was she going to fight battles or alongside someone that didn't benefit her. It wasnt her way. Purpose or not.