Welcome growlove.
I went through a similar situation as yours with my Mom although My Dad wasn't in denial. The difference for me was my Mom didn't want any help with her problems, and we struggled with that.
I would think it would be best for her to bring in the medical profession considering the amount of narcotics she is taking combined with drinking...I think detox would need to be closely monitored. Anyway, just my 2 cents.
What can you do? Be there, tell her you love her, and will do what you can, but know ultimately the decisions is hers to make.
Take good care,
~T