I had a FWB that was heading to an LTR, she crossed my boundaries, I demoted her (thanks HumanSockPuppet), and now she's trying to take back control with the "What are we?" talk.

I know that this a trap, but don't really know how to be smooth in avoiding it, I want to try new options before getting serious with someone, especially with her. Any tips or headlines for avoiding the subject while not letting the plate fall?