18, pregnant and partying

Is there anything you can do if you have a friend that is young, pregnant and getting drunk every weekend. Should I just stay out of it or is there something I can do? She doesn't listen to me or anyone around her. She doesn't just get drunk at parties, it's at home for no reason too. Should I tell her mom? She's a senior in high school. I'm just super worried for her baby and she says she doesn't want an abortion but she's hurting this way.. Any advice?