Dealing with destructive cat?

I agree with the other answers, you should try to exercise your kitty more, to tire her out and burn up some of that boundless kitten energy. It will probably get better as she matures. The one thing I think you need to deal with immediately is the cord chewing. Here is a piece that I wrote in answer to a similar question:

I would do the best I could to restrict their access to cords, obviously they can really be dangerous to a kitty if they chew through them. You can get fairly rigid spiral wraps to protect computer cables and such, and especially power cords. One normally bundles cables together, then wraps them with this material.

Humorous aside, only slightly related: The last place I worked (I am a software engineer, so I had several computers in my office) had a bit of a fetish for neat offices, including cable management. One Monday morning we got to work to find that over the weekend, management had brought in a crew to install these spiral wraps on all the computers in the plant, and the guys doing the installation clearly had NO idea how people use computers! My mouse had about six inches of free cable, and was of course unusable. That spiral wrap ended up in the trash within half an hour. Took us that long to quit laughing at the stupidity of the whole thing!

Our kitties are both Ocicats, and even though they did chew on things like mouse cables when they first joined us, Ocis tend to learn rules quickly, and ours now leave cables alone most of the time. We are endlessly thankful that our girls are so well behaved, they are such absolute joys!

What you have is a kitten who is being deprived of mental and physical stimulation. Cats get destructive when theyre bored! Sounds like you've tried everything BUT playing with the kitten to wear it out, which is the only thing that will work. Having toys and a tree are great, but you can't expect the kitten to entertain itself, and then get mad when it does by chewing up your laptop chord and couches. You have to physically play with the kitten. It doesn't know which toys belong to him and what things aren't toys at all like chords. My cat used to open my cabinets and break dishes. I was going to class all day and not giving him enough attention, so he acted out. A cat who's being ignored will seek attention even if it's bad. The kitten needs played with for a min of 30 mins a day, in 2 different 15 min sessions, or until it's worn out and ready to nap instead of shred the couch. No calming candles, collars ect are going to work.

Part of this is her age. She's in that obnoxious adolescent kitten phase that drives people crazy. Time will fix some of it.

As for the rest, if she's acting like this, she has too much energy. You need to play with her several times a day, and play until she's tired. Here's a great video that explains it: https://m.youtube.com/watch?v=sR4CBLBgne0