Leah knows she has to wear diapers constantly now, at least until she gets under control. Maybe she can come up with a positive spin on it, though? After a few minutes of thinking, she has her spin.
Leah has a small bladder. There have been many times where she had held it so long she barely made it to the bathroom explicitly because she was having too much fun doing whatever she was doing. Maybe the universe is telling her this is the answer. The convenience of diapers could allow her to continue having fun, despite her small bladder. Leah thinks about how many movies she's missed huge chunks of. But if she had been wearing a diaper...
Leah decides not to tell Tina and Rita (who is both wealthy and super cool) about her plan to take being diapered constantly as a chance to try the convenience of diapers. She doubts they would understand. Rita certainly won't. She seems to, despite being cool, have weird ideas about child development. She's surprised Leah doesn't need naps. When Tina talks about Leah's accident in the car, Rita merely says that she knew this could be a problem at Leah's age.
Eventually, Tina leaves. Leah settles in, then joins Rita for dinner (pizza delivery) and a movie in her home theater. Halfway through the movie, Leah needs to pee. She's about to ask Rita to pause, but stops herself. It takes very little effort to override her potty training and wet herself, which concerns her a bit. But she loves not needing to pause or miss the movie, and wets herself a few more times before it's over.
When Leah showers for the night, she's shocked at how soaked she got her diaper. But then again, she did use it a lot. She diapers herself again and goes to bed. Just as she gets comfortable, her bladder twinges. Leah merely lets it loose. She sighs happily as warmth spreads through her diaper. Before long, she's fast asleep.