To give a little background, in this old Supergirl story she is trying to convince a young boy that fairies really exist. (I guess a quick trip to San Francisco was out of the question.) So she dresses up as a fairie princess and ‘grants wishes’ to prove that she’s real. The boy decides that he wants a magic mirror that can make the plainest girl in the class look beautiful.
“And when I grow up, I won’t be able to move my face because of nerve damage from plastic surgery, and my body will end at the neck, although I’ll somehow manage to hang myself from the nearest tree! NONONONONONONO!!!!!!!!!!!”