Well, if we think about the girl in the goodnites story, she could be in a situation where she feels a bit self - conscious at first. Goodnites are designed to be discreet, but still, she might worry about others finding out. So the story could be about how she gradually gains confidence. For instance, she might start by hiding the fact that she uses them, but as she realizes that many other kids might have similar situations, she becomes more open about it. And this change in her attitude could be a central part of the story.
The girl in the goodnites story might be experiencing a common problem that many children go through. Goodnites are there to assist her. Maybe she's in a school setting where she's afraid of being made fun of if anyone discovers she uses them. The story could detail how she manages this fear, like by finding a true friend who accepts her regardless. Or it could be about how she educates her classmates about bedwetting and the use of products like Goodnites so that they become more understanding and less likely to tease her.