When I behave in a "bratty" fashion, it is usually playful. I do so because Mia'Cova often enjoys these little games. He likes discinplining me after I've misbehaved. He likes to have a reason to spank me (even though we both love it). However, when He is serious, I know it and behave accordingly.

I'm not sure if this is what your sub is doing. It doesn't sound like it.

Logic1 is right, get to know her. Just because it is a D/s relationship doesn't mean that you don't need communication. Learn what she likes in her every day life as well as sexually. Know her as a person.