I don’t think so. that Snow would allow such a spell for her this time. I think that she will want that Regina kill her, because of her guilt that she will not able to live with it. This will also the reason why Regina will not kill her. The greatest pain she can cause this time to Snow is to let her live with this pain and also she will see that it would hurt Henry to much.
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Heros don't get their Happy Ending!