You nailed it Tina. I remember when you first joined here, how you struggled. But when you chose to do it and you stuck with it one day at a time, it worked, and here you are. It’s the same for her.
I know your heart is breaking. It’s ok to feel sad. You love her. Anyone in your shoes would feel sad too.
Have you considered trying an Al-Anon meeting? It’s for family and friends of alcoholics. You may find it helpful 
Eric has a really good thread too: