Training pants during the day should suffice. If she needs to increase her protection, she can. During the night, however, she needs diapers. As evidenced by her mess.
Leah feels very proud and grown-up, making decisions without getting emotional about it. She pulls on the training pants and, to her relief, they aren't visible underneath her regular clothes. She walks around. They're a bit noisy, but if she wears loud shoes while she's out and about, no one will notice. And even if they did, the odds of someone correctly identifying the source of the sound are low.
With everything cleaned up, Leah decides to go out. As she's pulling on her shoes, she checks her training pants. To her shock, the color change indicator shows that she's already used them! She pats herself a bit. It doesn't feel wet. Maybe a bit damp. She'll be fine without changing herself before she leaves.
Leah leaves the house, locks the door behind her, and begins to walk to her destination...