She is throwing what is known as a "back-up" ball. For whatever reason there are a lot of women who throw this type of release. In my Thursday mixed league, 6 women are throwing this type of ball. Several are long time bowlers and are averaging in the 170's. The others are still learning.
In order for this to happen the fingers are coming up the left side of the ball. The girl may have a great follow through, but at release her fingers are left of center on the ball.
Good luck working with her.
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