I am so sorry.
It was so hard to know I didn't cause it. He blamed me over and over for his drinking. Alcoholics drink because they are addicted. That is all.
I couldn't move past my guilt until I found my own recovery in my own 12 step program.
If she is continuing to drink, the next few months may be very difficult. Please find support for yourself.
Prayers for her and all those that love her.