Sit your sub down and ask her what's going on. Find out. Then you may have to restablish some ground rule, or develope some new ones. Is she acting out to get your attension? Are you providing what she needs in this relationship? Does she really know what you need out of this relationship. As others have said your sub should be rewarded how ever that works for you and her. A pat on the back goes along way. If your sub needs a whip on the back, then know about it; suck it up and give it to her. Don't we all want to give a sub what they want while getting what we want? Well I'd like to.