When Pat asked have you talked to the breeder, I think she meant, did you talk to the breeder about these specific issues? And what did they recommend?
I would ask have you attended manners classes with your puppy? If not, I recommend signing up for a good positive reinforcement based class so you can start building up a line of communication between you and Kevin. The Certification Council for Professional Pet Dog Trainers is a good place to start, http://www.ccpdt.org/index.php?option=com_mtree&Itemid=16
Now to start going through some of these issues. It really sounds like your puppy is having impulse control issues. She has not been taught how or why she should control the wild puppy impulses. Its Yer Choice is a good game to start teaching your puppy that rewards come through self control, not through constant pestering. http://www.youtube.com/watch?v=ipT5k1gaXhc
I would also start rewarding calm behavior when she offers it. Rather than having her meals out of bowls at set meal times, for awhile make her earn her kibble through good behavior. If she is laying down calmly on the floor while you are watching TV, toss her kibble. If she start to get excited or wound up, the food bowl goes away until she calms back down.
If she doesn't behave well when she naps on you then she shouldn't be allowed to nap on you. When you need to move her from a spot don't try to pick her though, instead call her off the space and reward her with a cookie for coming to you.
If she is chewing underwear and socks then you are not doing a good job of keeping them out of her reach. Get a better hamper or close the door to the room with the laundry. Basenjis teach us to be better housekeepers or to literally "pay the price" of our laziness.
As for the chewing other stuff, restrict her access to those things either by closing doors or using gates, ex-pens, or crates. If you cannot be in the room to supervise then she shouldn't have access.
Use toys and play games that work her mind. This will help to tire her out and make for a more relaxed dog. You can feed one of her meals from a Kong while the other is being used to reward calm behavior. You can play the muffin tin game, go wild and freeze, or other games that will help burn excess energy. http://dogtrainer.quickanddirtytips.com/play-games-bad-weather.aspx