User blog comment:Waters Knight/Weiss killed 'herself' in the White Trailer/@comment-18396318-20131213231108

Okay, so the fight was definitely in her head, then. So the scar isn't from that.

On the topic of the reflection, though. Weiss has two directions that her life could go in. She could go her own way, or take up the Schnee Dust Company. Just be herself, or force herself into this prim and proper facade. Obviously she wants to go her own way, but she's choosing the other path instead. So I'm going to say she hates herself for it. Her standing there singing, doing the curtsey, being all polite and showing off for the crowd, is the knight. The way she's standing in the reflection of her eye is the same way she's standing while singing that, but also a very similar pose to the knight. She, in the fight, is the way she wants to be, but she can't face her other self without getting hurt, and she can never really defeat it.