We follow one iteration of Jess around the film, from the "first" time she steps on the ocean liner to the point where she "leaves".
She sees a lot of duplicates, one of which she manages to shoot in the head (not killing her, just grazing her fore head) and you can see a bit of blood coming out of her head, staining the hood.
We never see this line of events from the pivotal view of the version of Jess we are following from the beginning of the film. We only witness it as a foreshadow, right? Is this an error in the script? Can it be explained in-universe?