With my daughter explaining what, or even showing what the lower body and hips should be doing is one of the harder concepts to grasp. I grew up playing hockey, tennis etc, so it's easier for me to understand. She is a one sport girl..
Like Eric said...try different cues. One will click with your DD and then you will see that AHA look in her eyes. Also don't forget visual cues.Sometimes it takes finding another way to say the same thing to help them connect the dots