It might be that your mom was over - protective. She didn't want any accidents to happen, so she chose to put you back in diapers even if you were already potty - trained. She thought it was a way to avoid any mess or embarrassment.
One reason could be that you had some sort of physical problem. Maybe you had a minor injury that made it difficult to get to the toilet in time.
There could be a psychological factor involved. If you were going through a tough time, like starting at a new school or experiencing family changes, it could have affected your ability to use the toilet independently. Your mom, noticing this, put you back in diapers to deal with the situation until you were more stable and could resume normal toilet - using habits.
One reason could be a medical issue like the teen has a bladder or bowel disorder.
One reason could be regression. For instance, if the child faced a big change like starting daycare or a new sibling arriving. This stress could make them forget their potty - training skills.
One reason could be a physical illness. For example, if someone has a severe urinary tract infection that affects their ability to control their bladder, they might be put back in diapers.
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.
One reason could be for medical issues. Maybe there were bladder or bowel control problems that required the use of diapers for a while. Another reason might be a form of regression therapy in some cases where it is believed that going back to a more infant - like state can help with certain psychological or emotional issues.
One possible reason could be stress. Sometimes people in the ABDL community use regression as a way to escape the daily stressors of adult life, and the mother in the story might be doing the same.
Accidents during travel, as in Lily's case, can be a reason. Long trips without easy access to toilets can result in 'accidents'. Also, in some cases, if there is a lack of proper supervision or reminders during the potty - training phase, a child might need to go back to diapers for a short period to re - establish good habits.
It could be related to a developmental delay. If the teen has certain cognitive or physical disabilities that affect their ability to control their bowel movements, diapers might be necessary. Sometimes, it might also be a misunderstanding or miscommunication. Maybe the mom overreacted to a few accidents and thought putting the teen back in diapers was the solution.
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 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.