EXERCISE!!! That dog is at a prime age for attention and exercise. Get her out away from the house and play with her. Find what she is really into and make it fun. Put a little time in with her, leash walks, jogging, fetch, find her a buddy (neighbor or friends dog) to play with. Chances are she is just bored. As mentioned try not to kennel her when you are trying to punish her, if you are going to kennel her do it BEFORE she is on trouble. There have been lots of posts on here about what to do with pups and dogs when you cannot be with them all the time. My dogs are kenneled whenever we are not home, at night, and when we are so busy we cannot keep an eye on them. My 2 year old lab gets at least and hour of play time with someone each day and has the older (much calmer) dog to run around with as well. Good luck.