There are details you don't write about and maybe don't know. Is it certain that the young girl will be abused as a child? Might the change of custody be like an adoption? Maybe the person who is paying to take her will let her grow up at least some before he will make her pregnant. I think their is a saying in Afghanistan boys are for fun and girls are for babies. Seller might be selling his daughter into a better life. Her new custodian probably has the resources to feed her and give her shelter. She will probably be cared for by sister wives.
It is a horror that people are still bought and sold and a worse horror that children are trafficked to pedophiles.
Thousand of people many of them children are going to die due to deprivation this winter in Afghanistan. I hope that this girl is not raped and is well fed and sheltered.
TEK