User blog comment:The Devil's Advocate WP/The Troubled Soul of Blake Belladonna/@comment-4830106-20131111051345/@comment-187.107.165.210-20131120020955

as far as i still think you have gone a little far on the theory part, she probably is not the nicier person but i really dont belive she ever killed someone, i dont say that se woudn't, its just that she dont seems to have any motive till now. she left really clear that she dont like the new leader of WF, maybe at the point to kill, and looks like that Roman is not that far too, but she seems to care about life it self (just my impression).

i belive that she "avoid" the killing part  of the WF just because she dont agree, its like she dont recognise the killers as WF members.

now about the reasion of her supose leave, my theory is simple, and much more less bloody and brutal than yours: she leaves after WF do something big, maybe even atack other Faunus apart of Humans, and she thinks that it needs to change. she knows their hides,routes,etc so it would be easy to find and infiltrate on the WF, se would probably leave the team because she would think that its her job, her responsability, and she whant to protect her (probably unique) friends, AND she is the only Faunus on the group.

she has a dark, probably even darker than it looks past? higly probable, but i dont think that is THIS dark as you said.

anyway, the time will sove the mistery, all we have to do is wait =)