ill-gotten righteousness
And who is he that should count sour fruit as a gain?
Hilda begins to wonder if perhaps her name is the only truly precious thing Thief Girl has. If, regardless of its status as precious or not, it's the only thing she can truly call hers.
Well, then, of course she wouldn't want to share it. Of course she would be justly defensive. And of course Hilda wants to know it all the more.