Is your dog showing signs of separation anxiety. This means that she is uncomfortable being left home alone. Because dogs are social animals, it is not natural for them to be away from their social group (you) for long periods of time. However, most dogs can be left alone with no problems. Unfortunately your dog is not one of them and you will have to do some work in order to help her over her fear of being alone.
It is important for you to understand that your dog is being bad when she is alone because she is anxious. It is not due to spite or revenge. Because of this, punishing her for chewing the couch or soiling the rug will only make her more anxious. Recognize that she can’t help the things she is doing and decide that you love her enough to put the time into helping her.