I literally can't remember a crime story where the COLOR of a handgun the perp was using was reported. Definitely not "dark colored"...either TV or newspaper. And there are a LOT of crime stories; I live near Baltimore and DC.
Of course, that's assuming there was any gun at all.
The child is 9 years old. All she saw was the color of a gun. Didn't know the make or model or bullet specifications. She's a little girl in a terrifying position. What is so very difficult to understand about that?