Hi, I'd like to help you with your question.
It doesn't sound like this family member is interested in stopping her drug and alcohol use on her own. That is a big step to someone's recovery, as you might know. Also, if she is still in denial that is an issue. Overcoming denial using means the person has a good chance of recovery.
I highly recommend that you try an intervention. I'm not sure if you have heard of interventions, but they involve family contacting a professional who can help in the intervention. You can find one by contacting your local drug and alcohol treatment center or your local community mental health center may have available resources for you. The family meets with the professional and the addicted patient. The idea of the intervention is to break through the addicted person's denial and help them see they have a problem.
Here are some sites that describe the process in detail and give you a better idea of what is involved:
There are also some books that can help you. One is Concerned Intervention: When Your Loved One Won't Quit Alcohol or Drugs by John O'Neill and Pat O'Neill
and another How Al-Anon Works for Families & Friends of Alcoholics by Al-Anon Family Groups.
Al Non is also a great place to turn for your family in dealing with your family member. They offer support and guidance on how to handle her addictions and recovery.
I hope this has helped you,