This one was fun. Perhaps one could view it as a story that sort of encapsulates the way that horror stories in general compel the reader or viewer to wish to see what is beyond the door, even as you know it may not be good for you to see. But then, that dread is all part of the appeal!
Seems like Hailey sort of having it in for her friends may have been a subtext here. That would fit the title too. Her, "We are friends, aren't we?" line near the end also seems to suggest this. The artiste will be eye rolled and dismissed by her associates no more.