Having sex at 12 is still wrong. That said, crucifying a child like that is even more awful - how's she supposed to have a life after this? Blame the parents, but not the 12-year-old, she really is just a child.
That said, you can't even really blame the parents for not educating their child better as far as contraception goes - they probably had no idea she was into that kind of stuff already. That said, it's still the parents' responsibility to keep an eye on what Kid is up to.