The article linked to a jpeg of a section of the script that dealt with the relationship between Mathilda and Leon in which the two become lovers.
However if memory serves the film does have an uncomfortable relationship between the young girl and the Asperger like Leon.
With the man taking her to restaurants, giving her alcohol,
sharing a bed. And having her sing 'Happy Birthday Mr President' to him in a Marilyn outfit with lipstick and make up. Marilyn famously sang this on stage to President Kennedy when they were in the midst of an affair.
Or wearing adult underwear with make up for Leon.
Mathilda even confides to a hotel clerk he is taking her upstairs to have sex in one scene.
The Americans cut all this out for fear it would effect ticket sales, this was only in the European version.
It's worth noting a few of the posters enlarge Portman, or shoot her at angles that make her look older. Look at the height difference between her and Jean Reno in this film still, versus the poster.
Her choker and silent movie star hair cut might provide some visual evidence. Leon supposedly loves old films, who can Mathilda look like?
And what is with the plant symbol Leon carries around , it seems to mirror Mathildas Teddy Bear. They both dress alike, carry a visual security blanket. Many times Mathilda and Leon seem to be reflected in mirrored surfaces.
I read director Besson had a relationship with a young girl (i will post more details) so that line of inquiry may prove enlightening.
I found out all Bessons girlfriends and juxtoposed their ages when Besson met them, his age at the time and when he dumped them. Like a lot of Hollywood rich men Besson likes his girlfriends to be no more than early two mid twenties, while he ages.
Mila Jojovich (21-24 years)- Besson 38
Mai-wenn (16-21)- Besson 33
Anne Parrillaud (26-32) 27.
Lots of fans seem to identify with Mathilda. Fan art depicts her almost always post pubertal.
In any case, this is an extremely rough draft of an idea, and over the coming days i shall investigate further to see if there is anything in all this. I shall have to watch the film , since i only saw it once on the telly.