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Mrs. Fairfax is the extremely talkative witch friend of Fanny's with whom Lettie studies witchcraft. Of course Martha was originally supposed to apprentice with her, but when Lettie and Martha switch places Mrs. Fairfax immediately notices the difference. Mrs. Fairfax agrees to keep Lettie on in Martha's place (since she only wants to train someone who actually wishes to be there), but only if Lettie will study as her true self and drop the disguise magic. Lettie agrees.