In what way was Mathilda naive?

She was naive in thinking she, a 12 year old, could become a hit-man like Leon, that she could persuade him to deflower her, that she could rock up to the police station and just take out a senior detective, that telling a hotel receptionist that Leon is her ‘lover’ wouldn’t have consequences, that randomly blasting a gun out of a window of a New York apartment was a good idea.

She was a kid 🤷🏻‍♂️

that she could pull off that hairdo

She wasn't. The world is full of women like her making men do whatever they want.

In the same way that sad creeps, like the director and fans of this movie, have this absurd fantasy where coquettish pre-teen girls are continually manipulating innocent man-children with their sexuality.