Often, there are themes related to self - discovery. Since she is a character that might be reinterpreted in fanfiction, the story could be about her finding out more about herself, her powers or her place in the world. Love and romance can also be a theme, perhaps with other characters from the same universe.
You can try searching on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of fanfictions across various fandoms, and you might find some interesting Female Springbonnie fanfictions there. Another option could be FanFiction.net, although the quality and content can vary widely.
Definitely not a true story. FNAF is a work of fiction that takes place in a fictional world with its own set of rules and scenarios. It's all about creating a thrilling and immersive gaming and storytelling experience, not reflecting reality.