My friend cuts and I don't want to see her like this... How can I help?

One of my VERY close friends cuts and she can’t stop… I know she wants to but I understand her feeling of ‘wanting to stop but can’t’ only because I have a condition that is similar.. But it’s not self-harm.. But Anyway, she scratches drawings onto her arms and cuts here and there. I really want to help her since this could very well lead to her having suicidal thoughts just like my 2nd cousin.. I want to help her not end up like my 2nd cousin if at all possible.