"I know my wife has driven my daughter after drinking."
Your wife's behavior is absolutely inexcusable--and combined with your nonchalance, I am fearful for your daughter.
You say you aren't really considering divorce because it would hurt your daughter, but allowing her drunk mother to drive with her in the car doesn't hurt her? It literally could kill her!
My advice? Do whatever you need to do to protect your daughter. (This is coming someone who ended a ten year relationship with a very sick person whom she loved very much to protect her newborn daughter.)