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Only 1 foot must be entirely out of the box. This could mean any portion of the foot that is touching the ground outside of the box (line is considered in the box). For example, if her pinky toe is touching the dirt outside the white line, and the rest of her foot is in the air, and she makes contact with the ball - she is out. As for your second question, I would assume that if she meets the above criteria, then returns to inside the box and makes contact, she is out as well.