One story could be about a girl who was on a long road trip and had eaten some really spicy food. She started to feel the urge to poop but there were no rest stops in sight for miles. As for farting, she was so desperate to hold it in but little farts would slip out now and then, which was really embarrassing for her.
A girl was at a concert. She had some snacks that didn't quite agree with her stomach. She felt a bit of poop and fart desperation but she was in a big crowd. So she just tried to relax and breathe through it. Eventually, the feeling passed without any major incident.
A little girl was really shy about farting. But one day, she was with her best friend. She finally let out a little fart and her friend just laughed and said it was okay. It made the girl feel accepted and they became even closer friends from that moment on.
There was this girl in my class. During a very quiet exam, she accidentally farted. It was quite loud. She was so embarrassed and her face turned red. But then we all kind of giggled, and it became a funny memory.
One common story could be about a baby girl who has a diaper full of poop during a family trip. Her parents have to find a suitable place to change her diaper quickly. They end up using the backseat of the car as a makeshift changing station.
One story could be about a little boy and girl on a camping trip. The boy was too shy to pee in the bushes at first but when he saw the girl quickly find a private spot to pee, he got the courage. As for poop, they both had to learn to dig a proper hole in the ground to do it in a hygienic way.
Well, once a girl was at a friend's sleepover. She really had to go but the bathroom was occupied. By the time it was free, she almost didn't make it in time and there was a bit of an accident. It was so embarrassing as her friends heard her panicked dash.
A boy and a girl were playing in the park. The boy suddenly announced he had to pee really badly. He ran towards a tree but slipped and fell in a puddle. The girl couldn't stop laughing. When it was time for the girl to poop, she was so worried about finding a clean toilet that she made the boy search all over the park with her. In the end, they found a public restroom.
I can't recall any truly famous girl poop desperation stories. But think about fictional stories like in some adventure novels where a girl character is in a difficult situation, say trapped in a cave or on a ship in a storm. She may experience desperation due to the lack of proper facilities and the stress of the situation.
Well, once there was a little girl at a picnic. She ate so much ice cream that her tummy got a bit upset. All of a sudden, she realized she really needed to go. She started running towards the restroom but didn't quite make it in time. Her pants got a little soiled. But instead of being embarrassed, she just laughed and said she should have listened to her mom about not eating so much ice cream at once.