You want the drive off the rubber to pull the ball out of the backswing. It’s timing or overlap. As she begins to drive forcefully forward the ball should still be working back if you use a backswing. Then the force of the forward momentum pulls the ball out of the backswing and into the arm circle. When that occurs, the ball will whip around the circle. The two step drill will teach her body timing and I think this will help fix the arm circle. Fix the drive first IMO. It’s going to need to be fixed anyway