Victor, ultimately you have to do what you are most comfortable with.
That said, right now you have peace and serenity because you are no longer actively involved in the situation.
I would think long and hard before giving that up, because it is difficult to regain.
I am not sure which country you live in, but many places have special services for elderly, that will check in on them and make sure they are okay.
This includes those with addiction issues.
I do not have much experience with this, I have only seen them mentioned by others, so I will step aside now and let those more knowledgeable people comment further on that topic.
I believe I should also post the 3C's:
You didn't Cause it.
You can't Control it.
You can't Cure it.
You will not be able to cure your mother's drinking problem, no matter how much effort you put into it, no matter how many rehabs she attends.
She cannot find recovery unless she is the one looking for it.
You are in the right place.
You are not alone.