[techinstructor]

Best to teach the dog what TO Do, rather than focus on what NOT to do. I totally agree with teaching the dog to stay in a "place" during times that food is out and available. If possible, cover the food and/or keep it further back from the edge of the counter to lessen the allure. Every time the dog succeeds in getting something from or even getting onto the counter, that behavior is reinforced, so you need to not let that happen. Your dog has already learned that good things come from getting on the counter so you have to change that dynamic and teach her that good things can come from staying in an assigned place.

Additionally, I'd work to teach the dog, Susan Garrett's It's Yer Choice game which has great potential for improving impulse control. (Why “Choice” is the Critical Key to a Great Dog | Susan Garrett's Dog Training Blog)