As soon as a player is able to throw with a good arm circle, has decent posture, and throws at her fullest effort she's ready to learn the change up and movement pitches.
Even 10 year-olds can learn movement pitches. If I were to wait until a pitcher perfected her fastball to teach her a curveball, we might be waiting until she is a high school or even college!
For example, when throwing a rise ball, a pitcher must deliver the ball on the “upswing” of her arm circle, meaning a little bit later. To make it easier to get her palm underneath the ball and facing the sky, she must lean her body back towards second base at delivery. The reverse is true for a drop ball. She must lean forward to get her hand on top of the ball, palm facing downwards.
Once her body position and ball trajectory is correct, the Magnus Effect becomes relevant.
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