My once best friend and I had a falling out over a misunderstanding. I have tried apologizing to her but she still will not respond to my calls or emails.
It takes two to mend a friendship so if she won't accept your apology, you may need to part temporarily. Let her know you're always willing to reconcile.
Keep calling her. Or try talking to a mutual friend and have them tell her. It might take some time, but you can get through to her. Just be sure to explain what happened.