I've had this issue with ALL of my cats at one point (I think alot of us have with kittens lol) What really worked for my cats was loud noises. Take an empty soda can and put something that will make a loud rattling noise. For my cats, the noise was unpleasent enough that they ran off from what they were doing and eventually stopped chewing entirely to avoid the noise. It is really important to catch them in the act too, as punishing them after the fact really does no good, at least in my experience.

Edit: I just remembered too, if she is chewing on live wires this can be REALLY dangerous. Try to keep her out of areas where she can chew on wires when you are not at home as she can really hurt herself. I got lucky with Remus, as he chewed on a computer wire and got zapped a good shot, but it didn't do any harm. While it did teach him that wires were a bad thing, I don't reccomend this method of training .

I hope that helps!