The girl, Thylane Loubry Blondeau, and two others were photographed with heavy make-up and wearing tight dresses, high heels and expensive jewellery.
Vogue defended the pictures, saying it merely portrayed a common fantasy among young girls: to dress like their mother.
The article did not initially rouse anger in France, but was met with outrage in America and later prompted the French Government to open an inquiry.
Jouanno was commissioned to write a report on the issue. Her text, titled Against Hyper-Sexualisation: A New Fight For Equality, called for a ban on child-size adult clothing, such as padded bras and high-heels, as well as the ban on beauty competitions for under-16s.
When the report came out last year, she said young girls were being disguised as "sexual candy" in beauty pageants, which she said was a step backwards in the battle for women's equality.
Jouanno said that while the sexualisation of children was not as common in France as in some other countries, it was increasing rapidly and becoming acceptable because of what she described as the normalisation of pornography.
Michel Le Parmentier, who has been organising "Mini-Miss" pageants in France since 1989, said he was disappointed that the draft law involved an overall ban. Telegraph Group Ltd
