An SF writer said,
The cat sat on the mat is not a story; the cat sat on the other cat’s mat is a story
Was it Ray Bradbury? I can’t remember. If you can, help me out of my misery.
In any case, he’s right. A short story is not a situation, not even an event. A short story is a change, a discovery, a revelation.
What’s going to be revealed in your story?
This is a story about a girl who can fly – is not a story. It’s a situation. Presumably early in the piece, we’re shown this girl can fly. And then? What happens then? The fact that she can fly needs to lead to something, needs to help solve a problem, or maybe the girl has a problem because she can fly.
Alternatively: this is a story about a girl who finds out she can fly – is also a story. The girl will start off noticing some weird thing, and weirdness will get worse until the revelation at the end: Hey, I can fly!
So – what about your stories? What elements are setting and situation, givens that are revealed close to the beginning of the story, and which elements are true plot bunnies, discoveries that will change the situation, that will change your characters’ lives?