I highly suggest you attend alanon and get all the literature you can fit in your purse and read it ALL.
I also suggest you and everyone in her life, family,friends etc who are aware of her drinking,make an appointment with a local treatment center (Its free) to discuss options for an intervention and/or ideas on how to get her to go for either an evaluation or dr. appt.
All enabling must stop or she will continue as is. Its not too late for her. My friend Carlos got sober at age 67, has 4 years clean. My friend Bill got sober at 62, has 22 years clean.
It can be done, but its got to start with the family getting help first. Good luck.