I believe that the batter is allowed to change boxes any time until the pitcher starts the pitching motion, that is separates her hands at that point, the batter would be out.
If this activity continued, I would warn the manager that he would be in danger of violating rule 4.15 if this is an "OBR" league (i.e. LL or BabeRuth) or rule 5.4.E if playing by ASA rules.
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