seriously YLJ, the aim isn't for her to wind up in a young offenders' prison
she is simply not capable of any of those things and I'm damn pleased she isn't.
I can completely understand that you might have felt justified in what you did but that really is not a viable solution in this case.
However, fighting dirty in the sense of politically dirty, yes I can see that this might be a survival option... it's something I've used since leaving school to fend off the same thing from happening again. but really K isn't capable of that kind of guile, and I don't think that corrupting the sweet personality she has by teaching her violence and manipulation could be considered a successful outcome.