Not sure why you putting it under spoiler tags when she was was revealed to be revived in chapter 200 (and we already knew Nurarihyon was the one responsible).
Anyway, Nurarihyon revived her because he thought she would be useful in the war for the Nura side. And as we have seen last chapter, she does consider helping Rikuo instead of Seimei (due to Yamabuki Otome now being part of her personality alongside Kitsune Kuzunoha).
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