One idea could be that the girl accidentally got some poop on her car seat while she was out with her pet. She then has to deal with cleaning it up and her fanfic could revolve around her embarrassment and the crazy things she does to clean it without anyone noticing. For example, she might use all sorts of household items she had in the car.
Perhaps in the fanfic, the girl is a delivery driver. She ate something bad and suddenly had to poop really badly while in her car. She's trying to find a place to stop, all while her car fan is making this really annoying noise that adds to her stress. And then she has all these misadventures like almost hitting a pole while looking for a restroom.
A simple way could be that the girl is on a long road trip in her car. She has some digestive issues and accidentally poops a little in her pants. She then has to figure out how to clean up and continue the journey. Maybe she uses some spare clothes in the car.
One day, a girl went to a fair. She had a big funnel cake and some cotton candy. Not long after, her stomach started to rumble. She ran to the fairground's public restroom. But there was a long line. She was bouncing up and down trying to hold it. When she finally got in, she came out later feeling so much better and was joking about how the fair food had gotten the best of her digestive system.
Well, it could include things like the girl's age. For example, if she's a toddler, she might not be fully potty - trained yet and pooping in the diaper could be a normal part of her development. Also, the situation around it. Maybe she was in a public place like a park or a store and her parents had to find a discreet place to change her diaper.
There could be many different 'girl poop story' scenarios. Maybe it's a story about a girl who had an embarrassing moment with poop, like an accident in public. Or it could be a more positive story where a girl learned about healthy bowel movements and taking care of her body.
Well, she might finally find someone who has an interesting poop story to tell. Maybe it's a story about a time when someone was in a really strange place and had to go really bad. For example, being stuck in a traffic jam on a long road trip and barely making it to a rest stop in time.
She might be in a situation where she can't get to a toilet in time. For example, if she is in a long line or in a place where there are no toilets nearby like on a hike or in a traffic jam. Another reason could be that she has some kind of stomach illness that gives her sudden and urgent bowel movements which she can't hold back even if she is potty - trained.
One possible diaper girl story could be about a baby girl who soils her diaper frequently. While her mother is breastfeeding her, she has an accident in the diaper. The mother then has to stop breastfeeding momentarily to change the diaper. After the diaper is changed, the baby girl continues breastfeeding contentedly.
The 'dog poop girl' story is about a woman who refused to clean up after her dog pooped on a subway. Her actions were caught on camera and she received a lot of public criticism and backlash.
Once there was a girl named Lily. One day, she was walking in the park and suddenly saw some poop turds on the path. She was disgusted and immediately went to find a park keeper to clean it up. It was a small incident but it made her more aware of keeping the environment clean.
A girl could be babysitting. She has to take the baby out in the car. But then she realizes the baby needs a diaper change while they're in the car. She has to find a place to pull over and deal with the diaper situation in a bit of a rush.