His workmate Mario is helpful.
http://www.mccannpjfiles.co.uk/PJ/MARIO_MOREIRA.htmWhen you read what Mario says I'd say it is unlikely Madeleine operated the shutters on her own. " When asked, he said that the damage to the blinds was centred on the pull-handle, limiting their opening. He says that this kind of damage is quite frequent, given the fact of the need for some initial force to raise the shutter, sometimes associated with a lack of knowledge of the mechanism on the part of some of the tourists, who keep applying force, contrary to what is required, and which results in the violent destruction of the respective handles." They were difficult to operate.
In fact when you think about it sounds possible that the pull chord could become a health and safety issue. Could the shutter pull handle cause strangulation in the process of "violent destruction of the respective handles"?
Sounds unlikely for a little girl to attempt this.