St. Vincent's "Marrow": Imagination or Reality??

This song has been stuck in my head for at least a week. It's obviously a cry for help, but from what is the question. The video is really well done and adds to the mystery of the song when people from different scenes simply forget what they were doing and follow her. One article suggests that they are all dead people, or maybe she herself is dead. Maybe the whole thing is her imagination, and therefore a cry for help in such situation's is outside of reality. Its up for speculation, and the video rules.