A woman who is afraid of the dark learns that it is not being afraid of the unknown, it is being afraid of the unseen.

I’m not seeing a story here. You have only given us a character. The story is what happens to the character.

For instance: “After the lights mysteriously go out in her high-rise apartment. A woman with Nyctophobia must brave the dark in order to find her missing five-year-old daughter.”

Now we have a character (a woman afraid of the dark)
A situation (The lights go out)
A goal, (finding her daughter)
And conflict. (She must go into the dark even though she is afraid of it)

You add low batteries in her flashlight and you also have a time frame. she must find her daughter before the batteries run out.

Anyway that is just an example. Your story will be different but I hope you see how I put that together.

Hope that helped, good luck with this!