I can feel your pain in your letter. Much of what you have written might very well be your mother's future. Reading about it is not going to get through to her--her addiction makes sure it doesn't get through to her. What may get through to your mother are the experiences you describe. Your mother must feel the pain of all those losses to be able to say (hopefully someday) enough. Your words simply are not powerful enough--but life experience is. So set boundaries with your mother. Maybe she will come to her senses someday.