User blog comment:Zathronas/Speculative author: What is Cinder's plan?/@comment-10380701-20140804001719/@comment-10380701-20140804002248

Once the Hunters are out of the game, then Master Plan: Conquer Beacon/Vale holds quite a bit of merit. Pretty much the only ones who have the capability to stop her is Ironwood's army.

I personally think she's thinking bigger than that though, so Beacon/Vale may just be a stepping stone.