Just repeatedly tell her she has something on her face. She'll go look in the mirror and realize it's hair. She'll be really embarrassed but at least she'll think you just thought she had something on her face.
I second this.
You should be able to be direct with your SO, esp if they are your spouse.
No joke, I hate when people tread lightly with this shite. I love my wife, but what the frick is she gonna leave me? Who cares, there are 3.5 billion other women out there that I never hooked up with. To quote a wise woman, "my give a damn is busted."
So far have told her if she poops during childbirth, divorce.
If she gets fat, divorce.
There was one other divorceable offense, can't remember it though.