I think that because Cora is so strong and controling of her daughter, Regina could never blame her openly. When you have that kind of parent who is so authoritative, it’s not in you to stand up to her. Regina is so much under the thump of her mother, she simply cannot blame her, it’s just not in her. Maybe later when she became a much darker character and she became queen and got power of her own, she could start blame her mother and no doubt punish her for what she did.
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