Why am I afraid to tell someone my Mom is saying she is going to kill herself?

I think she's drunk and she's screaming "I'm going to kill myself, nobody loves me, no one cares, the world will be a better place without me." My Dad divorced her and he just got married and she's been struggling with menopause and depression. She has never been drunk before and I'm afraid for her health. I'm in my room crying more than i ever had before and I really want to do something, but I'm SO scared to do so. I want to call my grandma or my dad or 911 or something! But I can't!! I've never been more scared ever plus i have severe social anxiety. What if she does kill herself? HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!