^That.
Tell me how that scene needed it.
I can think of at least two pretty good reasons.
There is a difference between showing a naked woman and showing nudity. Unless I missed something that would spoil the upcoming hour-and-a-half, can you explain why the later was necessary, rather than the former?
There is a certain effect that it conveys. It’s in your face. It’s an uncomfortable scene for the character and it’s an uncomfortable scene to watch and the nudity is part of that. In that way, you sympathize with her and her exposure and exploitation (and, ultimately murder). It’s not sexual in any way. It’s gross, and that’s the point.
Another couple of nonsexual examples of this are Carrie taking a bath, or when she’s getting harassed in the locker room, and when the naked kid gets flogged in Lord of the Flies. It makes it more uncomfortable and disturbing, which makes for a more effective scene.