It is regrettable that there are those who make this girl's tragic destiny to take a racist point.
Yes, we know of the marriage between Muhammad and Aisha.
That this was a tradition in this part of the world regardless of religious affiliation talks less about, that it was even more common in Christianized countries to marry off their daughters at this young age (with the clergy's blessing) speaks even less about.
So can we leave this and learn rather than spreading guilt, for this girl that this article talks about is worth a better fate than to be the subject of religion, historical debate that shoots well under, over and past the target.
Learn all the girls from the start that they have a value, they will not put up with traditions that seek to oppress them. Then they can teach it to the girl beside him, which in turn can learn it on.
This to Muhammad married Aisha just to protect her from rape, assault or veil or whatever the excuses are.
Why could not he just adopt the child, instead of marrying the kid?
Adoption was around during Roman times. Julius Caesar adopted Augustus Octavius​​. So the argument that adoption did not exist then falls.
This is to protect children from rape and assault is pure tall stories, the argument to adopt the child stands.
Since we will not believe that all Muslims do so, the majority do not follow Muhammad's footsteps, but we have many bad apples that do, such as Hamas organized a mass wedding with adult men who married young children, for further evidence, I can link to articles and pictures about this event.
Are there bad apples among all religions are Christian priests who rape little children and Muslim men who marry young children
Even within the Christian world in the now time it happens that young girls are married off, there is such a number of "Christian communities" in the big country in the West, where this is done. So the only place in Islam or in underdeveloped tribes in Latin America is only half the story.