Is the old lady who swallowed a fly a fairy tale?

Hyperbole (over-statement for effect) examples include:

"she swallowed a fly, perhaps she'll die." Flies aren't poisonous, but the narrator is over-reacting to show how scary the thought of it is.

"it wriggled and jiggled and tickled inside her" Once you swallow something, you can't feel it in your stomach, but this line invites the listener to imagine the creepy feeling in the old lady's mind.