As my wife put it...women consider all other women competition.
It doesn't matter what they look like or who they are, they are the competition...and that includes us. It's a difficult thing for us to understand as we know we are not trying to compete, but if we by some chance look better in some way...a particular outfit, of course our styled wigs or whatever...we are the competition.
It took a long time for my wife to get past that...and it's still not completely gone. Just make sure you complement and compliment her.