In the movie, The Neon Demon (2016), Ruby and her two other friends, Gigi and Sarah
kill Jesse and eat her.
Ruby is in a bath tub full of blood, covered till her neck, after that there's a scene where Ruby lies on the floor naked perpendicular to a big glass window, moonlight slid through the window on her, that's when large amounts of thick blood starts to spread on the floor, necessarily coming out of her genitals, the scene ends with Ruby gently smiling.
What is the meaning of this scene? Is it a reference to any cult classic?