.....
Sometimes when people say "dark" they do not mean no light whatsoever.
Here's a question: We know that she was wearing her full police gear, including pepper spray and a Taser. She was almost certainly carrying a powerful flashlight. If she was entering a dark space where she believed a threat was lurking, why wouldn't she use her flashlight? A bright light would have temporarily blinded an assailant and allowed her to better assess the situation. One more act of reflexive stupidity.