Maybe he gave her a swingsetter for christmas.
There is a commonality among most of his big name students. Look at golfdigest swing sequences and look at els, scott, and wie. You will notice ONE person besides his students who has a straight rear elbow at immpact, I believe it was moe norman, EVERYONE else has more rear elbow bend at impact. Is there a relationhip? I think it might have something to do with it.