Right now we have 2 GSDs that are the age of 2 yrs old and I am actually pleased with their "no bark" attitudes. They will bark if out in the yard..but if me or my husband are out with them they will not.
We have had sales people come to the door and I answer the door, and the dogs are always right there, but they do not bark. I like that. They seems to more look to us first. I may be in the minority here, but it doesnt bother me that they do not bark at people, and it is definately a good thing living in a nieghboorhood as I am sure it would get old for the neighboors. It is scary enough to have them sitting silently next to me when a person comes up to the door...hehe
They will alert or bark at passerbys with or without dogs when we have the doors shut in the house. I am not sure what they would do if there was an actual threat..but I still wouldn't count on them to not lick the person...but that is ok with me.
I think friendly is a good thing. But then again maybe I secretly think they would just know if something was really wrong.
So, I wouldnt do anything if I was you. Encourage the friendly, esp since you have just gotten her. Build the bond, and the rest will come naturally. But I think you will be happy that she is a friendly GSD. And she probably will not need any encouragement with the barking!
I have seen tons of posts where people are looking to stop the barking...
Have fun and congrats on the new dog!!