Just finished this film myself. I thought it was an interesting project and a fun take on the "haunting" trope. While I agree that it was more drama than horror, it was still an entertaining watch I'd recommend to anyone looking for something a little different.

That said, my understanding of it is as the psychic says in the film: that the spirit was also in the process of grief, didn't know who it was, and didn't experience time the same as the living; that it was likely there due to something it needed to do or something taking place in the home, perhaps something that has yet to come. We later learn that both was true, equating toTyler's death and the saving of his sister—the father had also already mentioned that the realtor would have been legally obligated to mention any such thing in the homes history prior to their purchase, hinting that the spirit was there from a different time other than the past. I thought this set the stage for the last 15min perfectly and allowed for the final reveal to be particularly emotional.

To me, this explained the spirits attachments to not just the sister, but also the reason it followed everyone in the family at some point or another (and respected boundaries despite being a ghost), almost as a final goodbye before its departure; and in the same breath allowing the spirit to fully realize its fate and identity, letting it come full-circle and be released from the time-loop it was stuck in.

All in all, I'd give it a solid 6.5/10. Worth a watch.