Saw your photo, you have used 1/30" shutter speed to take that photo. And the girl there was moving so fast. Thus caused motion blurr. You need 1/250" to take that photo.
With your kit lens, it's difficult for you to take this photo. If you change to a 17-55/ f2.8, you can open up your aperture to f2.8, and use ISO 1000 or higher, then you can obtain 1/250" shutter speed.
Keep in mind that if you are shooting fast moving object, such as kids running, cars moving on the highway etc, you need 1/250" or even faster to freeze the motion.