I'm impressed by those of you who have the ability to determine someone's mental state over the internet.
/sarcasm.
My take on it is that there is no way in hell that a 14-17 year old girl managed to stab 30 different men with a knife successfully (by that I mean without any escapees, or injuries to herself). She either had help, or this is a false confession, which really throws her sanity into doubt, no? I could of course be completely off base.
Either way, there is way more to this case than any of us will ever know. We are foolish to make judgements with so little information.