How to get her to listen to me?

I’m currently 22 and pregnant. My mom has smoked her whole life and my dad passed two years ago from a stroke, he was a 9/11 survivor he was a cop and got cancer from it. i’m currently having a baby her FIRST grand kid and she been acting so excited but lately she had bad chest pains and we went tot he hospital and they said she has a bad cold bronchitis and COPD and can cause a heart attack and she NEEDS to quit smoking or it’ll get worse. She refuses and mopes around saying she’s in pain and her chest hurts and can’t breathe still smoking. I begged her to stop smoking because i’m so young; and my mom is like my best friend and I want her to be around her first grand baby. One minute she says she will before the baby is born when I mention it again she’ll be like “you guys are trying to take everything away from me” because she was a huge drinking from depression and she finally stopped because the arteries in her chest were clogged from so much beer and the fat in it and cholesterol . I’m so stressed because I have one parent left and she’s acting like she DOESNT care and it’s causing me to stress and i’m pregnant too. She is in her 50’s too so it’s not like she’s in her 70’s or anything. So she has time to stop and help it. I need help someone please help I feel like she doesn’t care about me or the family.