Again, K&H have made it quite clear that Blue is good and fights for what is right. I know many don’t see her that way. I myself, find her to have a wee bit of a snotty attitude. However, if the show creators say she is good than that’s pretty much that.
Only way I could see something like that happening is if Cora impersonated Blue or if Cora was able to take her heart.
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Keeper of Pandora's Box & The Yellow Brick Road.