“The Blue Fairy exiled her, but before she did, she took her wand.” Perhaps Blue took her wand, and exiled her to Oz, where she instead gained witchy powers, and became the WWE. Blue heard of this, and wanting to get rid of her for good, arranged for a house to be dropped on her. (This theory sort of assumes that Glinda is Sneaky, and is mashed up with Sneaky Fairy.)
I enjoy this theory and this mash up.
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"He was a lot of things to me" "The only conclusion was love"