Wellpht, please explain the slotting of the rear elbow by ADuction to a simpleminded country boy. Do you mean she should be rotating her forearms to the right and then slot ?
Flap your elbows like you are imitating a chicken. Kind of like the chicken dance. That is how I see most girls slotting their rear elbow as they launch their swing. Boys do it also. Slotting/tucking the rear elbow this way is one of the main differences that Mankin has identified between amateurs and professionals.
Now have someone toss you a ball from the side and pretend you are a second basemen turning a double play. Immediately after catching the toss, you will likely slid step and you will step with your front foot. Your feet will end up slighty greater than shoulder width apart as your lower body assumes an athletic posture. During the slide step your hands will separate as you prepare to throw. Freeze yourself just before you trigger your throw. Hold that position for a couple of seconds. Now trigger your throw paying careful attention to how your back arm works.
Do you see a difference between how your arm works while turning a double play and the chicken wing flap motion?
Some of us believe that slotting the rear elbow similar to how the throwing arm works when throwing a ball overhand is more efficient than slotting it using a flapping type motion. Do you see how the overhand throw type motion naturally keeps the hands stuck to the back shoulder? No dropping of the hands or push of the hands towards the pitcher.