Socialization is all about removing fears...the fear of strange sights and/or sounds. The usual approach is to work at a distance from the 'problem'...far enough away that she's not stressed. That's where you praise and reward calmness and confidence. If that has to be 50 yards or more away from the scary thing then that's the starting point. You move closer when she's no longer stressed at that distance.
She thinks it's her job to drive the mailman away. You need to show her that it's not her job by stepping between her and the window....you're taking over and now her job is done. This is not a quick fix. You have to do this everytime in the beginning but, she will start to relax after awhile. Teach an alternate behavior...have her go to a mat or a rug when people approach the door....that's her new job, go lay down....not bouncing off the windows.
She thinks it's her job to drive the mailman away. You need to show her that it's not her job by stepping between her and the window....you're taking over and now her job is done. This is not a quick fix. You have to do this everytime in the beginning but, she will start to relax after awhile. Teach an alternate behavior...have her go to a mat or a rug when people approach the door....that's her new job, go lay down....not bouncing off the windows.