@Catzanddogz,
If her friend said bad things about her, then that's not a friend and your girlfriend is better off without friends like that. Unless that person threatened her, she doesn't need to be scared. When someone is mean to others, it's because they are not happy with themselves. Personally, I don't care what anyone thinks or says about me and I'm a much happier person because of it. When you're happy with yourself and you know you're a good person, mean peoples words don't matter. I feel sorry for mean people because they are the ones who are miserable with themselves, which is why they try to make other people miserable. They can't do that if you don't let them bother you. Tell her brush them of her shoulders like the pesky bugs they are and forget about them. It works really well for me
Best wishes to you both