We are looking into another class for Katie Scarlett as well for this. We took puppy kindergarten and puppy graduate classes and she did great. But now I think she is in that adolescent stage and she is getting stubborn. Sometimes she minds and sometimes she doesn't. LOL. Thank goodness every one finds her cute or she would be in big trouble.
Anyways, there is a class at our local dog training center called 'stay/come no matter what' that I want to take with her. Maybe you could research classes offered in your area for help. I truly believe that continued education helps. Puppy kindergarten is great, but for me, we gotta keep on learning and reminding her of what she learned. Good luck to you hon!