User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-78.42.186.25-20141024020543/@comment-24218038-20141024130055

If they are others, then we haven't met them yet. I don't think anyone else does, just from a story perspective.

You have Blake explain why the White Fang put on Grimm mask, show only them using it,. Then you show a mysterious woman that wears the mask but she's not a White Fang and she's another organization?

My theory is that she's one of the good white fang, The previous generation who wanted equality with humans. That's why she left Yang at such a young age, to fight for her rights.