It might be due to a medical condition. For example, if the girl had a urinary tract infection that made it difficult for her to control her bladder, the mom would put her in diapers to manage the situation until she got better.
One possible story could be that the girl was sick and had some issues with using the toilet properly. Her mom, out of concern for cleanliness and the girl's comfort, decided to put her back in diapers for a short while. It was a practical solution during a difficult time for the girl's health.
One possible reason could be a medical issue. Maybe the teen has some sort of incontinence problem that has recently developed, such as a bladder or nerve disorder. Another reason might be for psychological comfort. If the teen is going through a really tough time, like severe stress or anxiety, the mom might think that going back to the familiarity of diapers could provide some sort of security.
Sometimes in a story, it can be for convenience during a special event or situation. For example, if the girl is going to be in a place where there are no bathrooms available for a long time, such as a long hike or a remote beach trip. Diapers can be a practical solution to avoid any mess or discomfort.
One reason could be that the girl has some medical issues like incontinence. For example, if she has a urinary tract infection or a problem with her bladder control muscles, her mom might put her back in diapers for a while to manage the situation. Another reason could be during a long journey where access to toilets is difficult and diapers can be a practical solution.
She might feel embarrassed. After all, diapers are often associated with being a baby, and she may be at an age where she wants to be seen as more grown - up. So being put back in diapers could make her self - conscious.
One possible story could be about a girl who had an accident while camping. She was far from proper restroom facilities and had to be put back in diapers temporarily for convenience and hygiene until they could get back to civilization.
She might feel embarrassed. After all, being a teen, she is at an age where self - consciousness is high, and wearing diapers is something associated with infancy.
The girl could also feel confused. She may not understand why she has to go back to diapers when she thought she was done with them. This confusion can lead to some emotional distress.