I can understand why you're annoyed; looking at this as if it were an isolated incident, it does seem as though your wife was awake (and thus not bothered by your daughter), and figured that it wasn't worth it to force her to stay home.

Maybe it would have been better if you would have been there for their conversation, and not waiting outside with your daughter's boyfriend (I think that's the part that would aggravate me)? Or maybe if your wife spoke to you first?

If it's still bothering you, I think you should definitely bring it up and speak to her about it.