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This is not all that uncommon. A lot of dogs act like this when their humans go to bed. It's likely to be: separation ANXIETY, resulting in aggression; herding behavior; or resource guarding.
I'd recommend a technique I saw on tv: practice departures with her, but make your behavior more unpredictable. Get up, say good bye, then sit on the floor and read. Grab your keys, then get a snack. This should interrut her behavior chain as she gets worked up. "THEY ARE LEAVING ME! PANIC! Oh, wait." Gradually leaving will become less scary for her. |