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Her depth at the tee does not appear to be the main problem, but she seems to be too far away from the ball. Yahtzee is correct in that she drags the bat and her hands are too low. Her shoulder also opens up too soon, causing a barring (straightening) of the front arm and the lack of space between her lead elbow and her left ribcage. Your daughters swing also ends low, wrapping the bat around her below her front shoulder.
Your daughter attacks the ball with her hands. Once the batter loads, she should attack the ball with her front shoulder as she takes a forward step, followed by attacking the ball with the sweet spot of the barrel of the bat by starting her hip rotation and pulling the bat through the hitting zone with her left arm, simultaneously. The front elbow should be higher than the hands, and the hands should be higher than the barrel of the bat. The swing should finish high....her hands should end up somewhere around her left ear.
Hope this helps
Len
My thoughts exactly. She's very close with some good mechanics, but the front shoulder is pulling off the ball, causing her to drop the front elbow and almost rolling the hands too early.