Woodman,
I'm sorry you are dealing with guilt. From what I recall of your posts, you spared no expense and you clearly loved her always.
She went to many detox and rehabs and she failed coming home multiple times. I think you are putting too much thought into quacking statements now that she is gone. Your mind knows you tried it her way a multitude of times over the years. You placing boundaries and consequences came years and years after the drinking got problematic.
Peace to you and yours.