Drinking while pregnant?

I KNOW that drinking while pregnant is not a good thing, i have a friend, who is on her 2nd pregnancy. She just told everyone, she says she has known for awhile and has just been waiting for the right time to say something. But she has been drinking, heavily, partying. With her last pregnancy she told me she had stopped drinking, but i found out after that she drank alot through the whole thing. Her first baby came out fine, no FAS. but what about now? Do i bring up that she drank before and she should stop, will it stop her? Im worried for the safety of both mother and child because she is, well DUMB she drinks and drives too. She could kill them both after a night at the bar. She is a big girl and most wont notice she is preg til later in her pregnancy! Im so worried! I tried to talk to her about it today but she blew me off. How can i approach this without her freaking?!