Hey there.
If your friend wants to talk to you about it, let her talk to you about it! It's great to discuss your feelings with someone, especially with someone you trust. I know you may not feel like quitting now, but these things take time. So your friend should be patient with you as you are patient with yourself. Maybe, when you feel like starting to change, you can gradually use alternatives to substitute the act of cutting... such as a rubber band on your wrists, squeezing an ice cube in your hand (that sounds interesting enough to do just for fun anyway haha), umm..drawing on your hand, and just various activities to do that may or may not have anything to do with cutting... like playing with a pet or watching tv. I hope I've helped you in some way! But above all, try to keep yourself from negavtivity in any shape or form, okay? If you want to chat some more, just message me! No offense if not