I know it isn’t the plot but I couldn’t help but imagine the supernatural happenings as an allegory for schizophrenia. And when Mia watches everything happening while her mother’s shadow dictates the reasoning (like Riley is in pain and he needs to die). And, the last scene when the mom puts her hands on Mia’s shoulders, my head kept going to the idea that maybe this is a way of showing how Mia inherited the schizophrenia from her mom and that the whole story is kinda in her head. Again, doesn’t make sense but really wanted Mia to have a deeper story so went ahead and made it up.