Telling her won't neccessarily make it better, particularly since she's made it clear she doesn't want to know. The one thing you could maybe do is establish some boundaries for DADT - like have her text you if she's coming home early. (Not from the driveway!) It is implicit in these types of relationships, where one overlooks certain behavior of their spouse, that one limits the opportunities for surprise.
Or, you could install an app on her phone that tracks her location. The excuse for this would be "safety - being able to find her if she gets in trouble." This would be BS, and you wouldn't want to do it without her permission, but again, looking the other way is implicit in this type of relationship.
