Well, it seems to me that your friend truly cared for you but it was hurting her to see you still in an abusive relationship. When you are close, it hurts to see a dear friend in that sort of horror. Now you are free and doing well, I feel it would be good for you to write and let her know how things have moved on since then. I'm sure she will be mighty proud you got out and are now restarting your life. You have nothing to lose in writing to her.