My gf is so scared of my dog

My girlfriend just moved in with me and sheís so scared of my dog. I have a beautiful german shepherd girl who gets a bit aggressive when there are other people around. My dog barks a lot whenever sheís unfamiliar with people. Since my gf lived far away, we didnít really hang out much in my house and so, this is the first time my gf will be around my dog and vice versa. My gf did mention at a social romance tour we attended that she is scared of dogs but I didnít think much about this because I didnít know the extent of her fear. I didnít know she was THAT scared to the point that she wonít go out of the room since she fears that my dog will follow her around the house. She screams when my dog gets too close to her and she almost collapses whenever my dog tries to jump on her (my dog is very playful). How do I make my gf comfortable with my dog? Who should I call for help regarding problems like these? Thanks so much.