I am recovering 28 years and am grateful to God that I got sober before I had children. As a child of an Alcoholic, you may want to look into Alanon. If it is something you choose not to have in your life, you have the right. You could consider writing a letter to her explaining how her drinking affects you and why you are choosing not to be around that and to let her know that when she is ready, you are willing to support her in sobriety, if you are.
I wish you the best.