I also have a friend who does this. I've known her a few years now and it is still painful when she does this. I've learned, though, that if I leave her alone, she will come back around. I miss her in the meantime, but I've learned to accept this about her. I think she appreciates this, too. She is so afraid of others abandoning her that she has this way of pushing those closest to her away. It's kind of a self-fulfilling prophecy. Be patient. She will be back and she will probably be very happy to see you are still there.