The Fairy Old Lady is a sick woman that Cosmo was intended to take care of.
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She was seen in Who's Your Daddy?, where Cosmo was a fairy scout. On several different occasions he was trying to help her but failed each time due to his stupidity, usually at her expense. She is characterized by her rudeness.
The things Cosmo help her with include helping her cross the street, getting her cat out of a tree and giving her her medicine.