Long post : Best friends.

What do you do when your best friend really isn't your friend anymore? It seriously started over something so stupid. Something so little, like Facebook. It's starting to bother me less & less that we are no longer friends. But it still hurts me that she was so nasty over something that wasn't even worth the trouble. I am giving her, her stuff back (obviously) and giving her back a gift she made such a big deal out of. I work a full time job and don't have time to be around whenever she snaps her fingers. I'm not that type of person. I'll do what I want, when I have the time and means to do so. It just wasn't good enough for her. Obviously our friendship didn't mean that much? She can tell me what I've done wrong all day long, but when I say something back I made it up, and I'm psychotic. I would tell people she was my best friend, but she would just say "you're one of my best friends. Just not my best best friend." How do I handle this? I've apologized and asked her to sit down so we can just hash it out in person instead of fighting over Facebook messenger like a 15 year old, but still nothing from her.