Jail the mother and return the child.
Why? Because if we become even slightly lenient on this matter, it's very possible people will think of it as "Oh, I guess it's alright if I kidnap children as long as I take care of them!"
No, absolutely not. Having the child live ignorantly with a parent she did not belong with isn't going to solve the issue, it's going to traumatize her in the short term to move in with her biological parents but they have every right to take care of their own flesh and blood.
Regardless of whether or not the child has issues, it sets an example and makes sure that people are still aware that doing this is very wrong, and that you will only harm the child in the process, deterring people from doing it again.
I can't imagine more distraught mothers watching this story and going "Oh, so if I just kidnap a child it'll all be okay!"
tzimize said:
SteelStallion(Demented Shaman): OMG NOOB WHY U PICK NOOBHOUND WTF CC 15 MIN