I really don't think I'm going to forgive my friend
Why would you not forgive her? Have you tried to discuss what happened with her?
She shut down and didn't want to talk, so how can I forgive her?
I know it hurts when people have done you wrong, but I think that you should strive to keep your relationships with other people intact. Have you tried maybe asking one of her friends to do an intervention?
That's weird, you sound like a counselor.  Yes, I've tried, but she ignores me, even when I try to explain.
While forgiveness can be a two way street, it doesn't have to be. You can forgive her and move on without her participation. Hopefully one day she'll also come around and forgive you.