Sleepy dog

Kai, is 1 year old and she has regressed somewhat this week. On walks she seems oblivious to any commands. I took her to the dog park yesterday and she rough housed with other dogs for about an hour, then we went for a walk around 4 to get any last energies out. Usually, we run or walk fast on the last walk of the day but yesterday she just kept stopping, pulling backwards and not listening to any commands. I thought it was because she was sleepy, because when she came home she curled up on her bed and slept. She was so tired from our day that she did not even get up when I was cooking beef stew. Usually she begs for anything I put into my mouth, but she did not wake up. She only got up when I moved into the TV room. I am thinking this is a good deal, sleepy puppy equals, two walks and a dog park. This morning she slept in until 8, which unusual as when she has had a tiring day the day before she is usually ready to go again in the morning. The only thing she did do this morning was be a pest on our morning walk. She was always either pulling ahead or stopping and pulling backwards. When we came to a street she just tried to jut out, I had to keep pulling her back to the curb as, come, was not being listened to. Now she is growling at me and not in a pleasant I am going to play with you way. Maybe she is still tired, I did something I do not usually do I gave her a tap on the butt, not too hard but enough to let her know that was unacceptable behavior. She immediately backed off, after realizing I was mad. I also took the thing she stole from the kitchen, which is why she growled, but it was not a play toy and she was being very destructive. So sleepy puppy or monster pup, who knows.