Do I break it down step by step by step? Stide, Plant, rotate, swing? Etc?
Build from the ground up. Her stance is OK. She has to learn how to weight and unweight the back side (ie, load). Don't sway back, don't scrunch down, just unweight the front foot and gather on the backside (see model below). She needs to understand weight transfer, and how to keep the hands back. Notice the red lines below. Separation between hands and hips as she's striding (not before she strides, but during). I'd suggest getting this down, then learning to swing from there.
Excellent, often re-posted model: