She blushes incredibly red, when he mentions that he knows the truth, and says nothing in reply, listening to his story with rapt attention; while he may not be able to control a room like Garrus can, his words still capture her, easily, as she listens, awestruck. When he finishes, she starts, slowly, to give her story, the real reason why she and her sisters were given away. While Rose had annoyed Rexxar with her rather pointed comments, the truth was that he was a drunkard, and very aggressive, in more ways than one. While Rose and Bella were away on a mission, she was invited to a night with him, during which he got quite drunk, and tried to take advantage of her... and she almost let him, too shy to actually resist his advances; only hen he started stripping her did she actually start to protest, but she didn't manage to get him away before he'd molested her for a little while, almost convincing her that she really wanted it. Only when she finally worked up the courage to tell him, quite firmly, 'no', did he back away. She didn't tell her sisters, for fear Rose would do something really stupid, that might get them killed, but, given his reactions to them, afterward, she knew that was the true cause of their banishment.