I could definitely see the Blue Fairy retaining memories – she did have to rush off before the curse was enacted for the fairy’s ‘final preparation’. My only real issue with this is the fact that the Blue Fairy was hit by the waves of true love and did seem to be effected/restored memory IMHO. But, that doesn’t mean she wasn’t a good actress or had been using a limited collection of memories in her behind the scene workings.
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