User blog comment:SomeoneYouUsedToKnow/.-.-.-.-.-./@comment-25396609-20171214003642/@comment-24994749-20171214174357

You could argue that technically, she said they had not MET, not that she had no idea of who they were.

Or more simply, maybe she doesn't know Watts by face, but he is known by name. So, when Cinder introduced him, she put two and two together.