I would suggest placing her in another home or rescue. More than likely dobermans just aren't the dog for you. You should probably do some research about smaller/less high maintanence (sp?)/less energized dogs. There's gotta be one out there that suits your lifestyle. But always research a breed of dog before you buy or adopt.
Another good choice: mixed breeds! There's so many out there that need homes and many are laid back dogs who don't need tremendous amounts of excercise or training. It also sounds to me like you need an older dog. One who's more laid back and has all of his training/socialization and most of his puppiness has calmed down.
If you do decide to place your doberman elsewhere please find a good and loving home that are willing to take care of her needs.