Women on dating sites know that they can get away with writing short profiles.
She already knows that regardless of how long or short her profile is, men are liking or messaging her regardless.
Why bother sitting down and concocting a well-thought-out bio for her profile over a long period of time, when all she requires is to post attractive photos of herself to her profile?
As far as she is concerned, she is going the extra mile by writing anything at all in her profile.