One thing to keep in mind is that in a society like ours, we assume that a bride price = selling. In truth, though, demanding a price in exchange for a daughter is a symbol of her value to her family, and it is compensation for the family's loss of her labor/goods/self. Nor is it unusual for a groom who can't pay the price to make up the difference in his own labor.

Traditions like dowries are a sign that women are valued less, because the family pays to make the daughter go away -- she is considered a burden, and the dowry is compensation for the man taking on that burden.

I feel sorry for the girl, but her family IS trying to make provisions for her safety and well-being. I may disagree with the method, but she is luckier than many girls around the world who are considered a burden and ignored or denied care. And if the groom is 15, it's not really that bad. She certainly doesn't LOOK 12 -- if she's 12 she's very mature for her age.

Fortunately, it's not as if she was being married to a much older man. My gr-gr-grandmother was 13 when she married a 57 year old man because her family always told her she would have to -- eventually she did it "willingly." No one seemed to think it untoward at the time.