It was my understanding that Cora wasn’t aware and that Snow telling her really was the reveal. However, when she did realize her daughter was in love with a lowly stable boy, there had to have been other ways to handle the situation besides pulling your daughter’s true love’s heart out. I can see Cora ripping out a heart being very much aware of the turmoil this will send her child into. Maybe emotional trauma/hatred/deathoftruelove is what awakens Cora and Regina’s type of magic? If Cora had already manipulated events to make her child a queen, finding a situations to awaken her magic (even more power for the family) would have just been icing on the cake!
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