You absolutely need to get some obedience training with this dog. Schedule a class as soon as possible. Right now she thinks she is in charge, and is protecting you, and the house, but she will be far less anxious and therefore less barky, once you get some training with her, and learn how to teach her "the rules."
Dobermans are naturally protective, but they are also VERY intelligent and will respond to GOOD, properly done training. Don't try to do this yourself, get you and she enrolled in a good class somewhere, as soon as possible.
Meanwhile, if there are going to be strange people over, take her for a long walk/run to tire her out ahead of time, and then keep her on a leash ad with YOU at all times.
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