Oh dear, this is a hard situation. Your mom is manipulative, trying to drag you to “help” her which honestly is just not wanting to cope with the consequences of her own behaviour and attitude. I digged deep into codependent literature and al-anon. The first and foremost message is: Don’t “help” the addicted person, detach (if possible in love) and build healthy boundaries. You and your safety, sanity and health have to come first to protect yourself. This also is true for your financial safety, you must come first to manage your own life. No is a full sentence.
There’s a good thread on loved ones who are addicted. Maybe you want to read around there. You are not alone!