I can be bratty and be abit much at times...But theres a difference between being bratty and being annoying at all times. There are some people consider themselves to be submissive but in real life just like to be man-handled and thrown about. Testing is one thing but totally disrespecting the Top in the relationship just to get some twisted needs met is wrong(imo) Now if the two parties enjoy this type of play, so be it..
But punishment should be an instructing tool..Not something that you have to use just to get your way with this "bottom" who maybe trying to T.F.T.B.

As den, stated, communication, honesty and committment will help this relationship andall others. she might be missing something, maybe you arent the dominant for her. Doormats arent fun, but You shouldnt have to try to break her. Giving you what you need an obedient, loving and caring submissive. One who listens because she wants to, not because you had to force your Dominance on her.

just my five cents