Sure is a drill
Have her stand in the finish position. Swing the arm back and forth in the swing slot. I usually have beginners start without the ball then when they start to feel the correct swing slot, add the ball. This can be done in front of a mirror also. Once your wife can see the correct slot in the mirror, with you watching to ensure proper form, then she can practice it without your help. Five minutes a day and a free arm swing with a correct swing slot will soon follow.
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