In order to deliver the golf club powerfully into the back of the golf ball, you must maintain a firm base with your lower body and create a powerful backswing coil. This coil results by turning the upper body against the resistance of the lower body. Good players facilitate the creation of coil by maintaining the gap between the knees on the backswing (right). They unleash the energy stored in the coil by closing the gap on the downswing.
Lots of women lose distance by not releasing, or turning their arms over, properly through impact. When you don't release properly, your left elbow goes up after impact, your left palm faces the ground and your weight stays back on your right side.