It has a beginning (girl is troubled), a middle (girl takes a risk, uncertainty and ambiguity about the outcome of said risk), and an end (girl's ouroboros, the source of her troubles, is removed, girl moves on.) It has two characters following different paths who alter each other's courses (girl directs demon home, demon removes girl's infection). It has character arcs. It doesn't have a lot of action, this is true, but neither is it a vignette, which focuses solely on conveying an impression of an object, character, or scene.
If you're going to criticize, at least use words meaningfully.