To dream of a fairy - is a favorable sign for all, as the phenomenon is pretty charming girl or woman always brings joy.
An enchantress exudes the destructive side of the Feminine, represented by, for instance, Lilith, the first wife of Adam, who created demons in anger, or the Hindu goddess Mohini. The enchantress can appear in dreams when a woman begins to come to terms with her self-destructive side. She is to be understood rather than feared. The enchantress is such a strong image within both the masculine and feminine psyches that she can appear in dreams in many guises. She is the feminine principle in its binding and destroying aspect; the evil witch or the beautiful seductress. She has the power to create illusion and the ability to delude others. You might like to consult Archetypes in the Introduction as well as the entry for Siren for further clarification.