Originally, this story was about a weasel, an animal which the ancient Greeks kept for pest control in the way we keep cats. Modern Greek versions of this story make it a story about a cat, as did Victorian storyteller Joseph Jacobs.
ONCE there was a cat who fell in love with a handsome young man, and was tormented by her love, for which she could find no relief. So she called upon the goddess Aphrodite, begging her to turn her into a woman.
Aphrodite felt sorry for the lovesick cat, and did indeed turn her into a very lovely young woman. Naturally, the young man immediately fell in love with her, and they were soon married.
Aphrodite, however, was curious to know just how deep the transformation went, so in the middle of the wedding breakfast the goddess let loose a mouse among the guests.
The lovely bride spied it, and quick as a flash dived after the mouse, pounced on it, and caught it. When the goddess saw that, she instantly turned the blushing bride back into a cat.
And the moral of that is, that however much you change your appearance, your character will reveal who you are.