Well, she did exactly and succinctly demonstrate the freedoms that come with being an adult and what the consequences are for exercising them.
A+ lesson, 10/10
(As an aside, I hadn't interpreted this as some sort of dark twist ending, like some others had. Just a comedic jab—I didn't think the woman was a kidnapper, just someone who'd forgotten that children sitting by the riverbank are not necessarily free-range and maybe you shoudn't wander off with them just to continue your conversation like you might with, well, an adult.
I'm sure the nice policemen will understand.)