How to help an alcoholic?

Okay. My girlfriends mom is an alcoholic. We’ve recently found out in the morning (4 to 5 am) she takes shots of vodka and when she’s off work all she does is drink. She buys liquor every single day. She has it in her car her bathroom her purse she has it hidden all over the place so she can drink. We’ve confronted her about this and how it’s effecting our relationship with her and she won’t stop. She’s been drinking and driving as well and i just want her to get help because I’m worried and my girlfriend is too. I just need advice on what to do.