Before we land on any others, let's pause a moment to look at one who wears the name - Fly Girl.
The Fly was a superhero from Archie comics. One who was clever enough to think, "Hmm... Maybe a female sidekick would be better than a kid in shorts." And, so - Fly Girl.
For a quick look at the character and how she was portrayed, here's a trio of Fly Girl back-up tales from 1962, written by Robert Bernstein with art by John Giunta -
pages by Robert Bernstein and John Giunta for Pep #s 153 & 158 and Laugh # 136 (1962)