I won't go into a long explanation, but the point is this: don't chase "proper" spin at the expense of mechanics and speed. If her mechanics look good and she's throwing strikes at a good speed then don't chase a certain spin by changing mechanics. Let her develop the spin at release during drill work.
One of my pitchers can’t throw 12 to
6. I never asked her to change. She has a good curve and rise because the spin is closer to her natural spin.