The batter is out and runners go back to bases they were on before pitch. Whether she swung or not is irrelevant if she was partially out of the batter's box.
If she had kept both feet in the box, the no-call probably would have been correct if she in fact did not intentionally do anything to interfere.
If she had kept both feet in the box, the no-call probably would have been correct if she in fact did not intentionally do anything to interfere.