Board Thread:The Kane Chronicles/@comment-5896827-20160804001247/@comment-28759193-20160805211754

Nah bruvs. Carter, it a tough fight maybe she can beat him. Amos? No way. Amos is the freaking Chief Lector. And Carter is the Pharoah, which if I even recall is higher than the chief lector, meaning Amos lives in service to Carter, as he sits at his feet, literally.

So yeah, I think that is where we get the idea that she is third, Carter being Pharoah and Amos being Chief Lector. Though, there is no where that it is directly stated, you're right.