I think that the rule you quoted about "one foot on the ground completely out of the box" is the wrong rule. That's the rule about where the batter's feet can be at the moment the ball is batted (ie: when the bat contacts the ball).
That ship's already sailed. When this batter hit the ball she was (I assume) in a legal batting position, with no foot on the ground completely outside the box.
Now we have a batted ball over fair ground. When the batter stepped on it she contacted a fair batted ball outside of the batter's box. Dead ball, out.
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