Dogs are natural chewers and diggers. Its part of the history and inherited traits of all dogs. To help break the cycle of chewing things you don't want your dog to chew, have actual chew bones to offer every time she starts to chew something you don't want her to chew on. When you see her chewing on something you don't want her to, just switch the bone for the item, if you do this consistently, she will get the idea and besides the bones taste better than the other things, especially if you get the flavored ones. In addition, there is a spray you can spray on things that does taste bad, I wouldn't spray it on everything, just the things she keeps going back to the most, but again when she goes for that item, offer the bone instead. For when you leave her alone at home, have you crate trained her? If you train her to go into a crate at night, when you leave the house and what have you, make sure she has plenty of clean water, a toy or two and the chew bones in there with her. If this doesn't work, I would try a dog obedience class, usually held at the "Petco" and "Petsmart" chain stores several times a year, as well as several privaate trainers that you can probably find in the phone book, or through your vet.
I wish you good luck, and happy training.
