As the sister of a fetal alcoholic syndrome baby (now grown up, if you could call it that) I'd encourage you to give her information on FAS, along with the local AA number, and then get as far away from this cruel, stupid, self-centered person as you can.
Sorry to be so judgmental, but this is a person who is willing to create a living being whose life will likely be a living hell, who is willing to trap an unwilling man into fatherhood (did I mention I am also the daughter of a man who didn't want me?), and who is putting the burden for her own recovery from drug abuse onto the head of an innocent, unborn baby.
If you want to hear tenderness for your friend, please ignore me and instead read some of the (more patient) posters above. I myself would reduce the Crazy Factor in my life by staying away from so-called "friends" like this. You cannot save her - you can only choose whether you want to take a front row seat to her madness and cruelty.