George, what you're desribing is someone that might have a weak wrist. I've got a student bowler doing the same thing and it's tough to get them out of it. One way I try to help them is to explain when they release the ball to have their thumb pointing straight up to the ceiling. That's using the KISS theory. If she is able to do that she "hopefully will have to stay under the ball longer at the release point. Give it a try. Also if she does't already have a wrist device...get her one and have her do the thumb up drill. That also should help.
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