User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-25195920-20141024015616/@comment-10390252-20141024114117

@ Zathronas,

White Fang was originally set up as a symbol of peace and co-operation between Human and Faunus. I suspect that, originally, it was cross-species and had a large number of human members. It's just that the human members were all purged (more or less bloodily) when the current radicals took over.

Raven, Yue or whatever her name is might be a Faunus but there is no reason to rule out that she isn't a remnant of the human membership, still trying to fight the good fight.