@Tcof I can only assume this as, for the fact the law doesn't make a difference on weither a minor is mentaly mature or not, Masked-man still is responsible for picking up a runaway minor without informing the authorities. It is forbidden by the law, and he still would serve 1 or 2 years in jail at worst.
Even if "Sachi" here could be placed in a juvenile protection care if she surrendered to the police, but there's a chance the parents would outright deny the abuse as they are sociopathic and manipulatic, and since everyone involved with her were in some point jerks, she could very well end up in her parents grips again. At this point, you can imagine she could very well end up being killed for real by her parents.
Sachi would never take the risk, she even tried to commit suicide at some point to escape the possibility of getting caught.
No matter how you look at it, she won't go to the daylight again, at least not alive.
@TheDevilsApprentice It's way too cliché, I doubt it ever gonna be it.