All children have their "naughty" moments, but the problem here, unfortunately, seems to be you. The more you shout at, & smack your daughter, the more she's going to copy you, which just perpetuates the situation. Does your little girl go to school yet, or to a nursery/playgroup? This'd give you some time to yourself. I had two children close together, and things weren't always easy at first, but you have to set firm boundaries, and stick to them. Rewards for good behaviour, & praise for when she uses her manners, WILL work, but you have to learn to have more patience. Refuse to be drawn into confrontation with your daughter, and speak quietly, but firmly, when asking her to do something. If children think they can get away with things, they'll push it to the limit, but just take a deep breath, and give her some rules to follow. It'll be worth it in the end. Best of luck.