It's not really okay in normal circumstances. But if she is in a survival situation like being lost in the wilderness, her basic needs take precedence. In such a case, she would need to make sure she is away from water sources to avoid contaminating them and also be cautious about not leaving any waste in a visible or harmful way.
Once there was a little girl named Lily. She was out playing in the park when suddenly she felt the urge to poop. She quickly ran to the public restroom. Inside, she found a clean stall and did her business. After that, she washed her hands thoroughly and went back to playing, feeling much better.
Once there was a little girl named Lily. She was so engrossed in playing on the swings at the park that she ignored the urge to go to the toilet. As she continued to play, suddenly she couldn't hold it any longer and had an accident. She was very embarrassed but her friends were kind and helped her clean up. They told her it could happen to anyone.
There was a baby girl. She had a cute pink diaper on. During a family picnic, she started to seem a bit fussy. Her dad soon realized that she was pooping in her diaper. After she finished, there was a bit of a smell. But her parents just laughed it off. They took her to the car and changed her diaper. The girl then was content and fell asleep in her mother's arms for the rest of the picnic.
Once there was a little girl named Lily. She was so excited to go to the amusement park. She ate a lot of cotton candy and drank a big soda. As she was waiting in line for a roller coaster ride, she suddenly felt a strong urge. She tried to hold it but couldn't. And unfortunately, she had an accident in her pants. She was so embarrassed and started to cry. Her mother quickly took her to the restroom to clean up.
There could be the setting where it happens, like in a school bathroom. For example, a girl might be in a hurry during the break between classes to use the toilet.
Once upon a time, there was a little diaper girl. One day, she was playing happily in the nursery. All of a sudden, she felt that familiar urge. Her face turned a bit red as she started to poop in her diaper. Her mother soon noticed the smell and came over with a warm smile. She gently changed the diaper girl's diaper, and the little girl went back to playing as if nothing had happened.
There was a girl at a camping trip. She ate too much junk food and then had to run to the portable toilet. But there was a long queue. She was jumping up and down in desperation. Finally, when it was her turn, she was in there for quite a while and came out looking much relieved.
Once there was a little girl named Lily. One day at the park, she suddenly felt the urge to poop. She ran to the public restroom. But the door was stuck a bit. After some struggle, she got in. She was a bit scared at first in the big stall all by herself, but she managed to do her business and came out feeling much better.
One reason could be that she was too engaged in an activity, like the girl on the swings. She was having so much fun that she didn't pay attention to her body's needs. Another reason might be a lack of access to a toilet, like the girl on the long car journey. There was nowhere to go so she had no choice. Also, being distracted by excitement, such as at the school event, can make a girl forget about the urge until it's too late.