My thoughts on movie (spoilers).
I didn't like the movie but that is more a personal preference than any big faults with the movie. The ending reminded me a little how I felt after watching Mother.
The actress who played the daughter did a good job portraying a disturbed young lady.
How can a family with someone who has a nut allergy would go anywhere without an epipen (at least stored in a kit you take with you in the car)? Especially when attending a party where food was being served and in rural area.
Don't know how anyone could go straight to bed after that accident (assuming shock and some mental health issues). The shot of the pole with the symbols before the accident must have indicated there was some supernatural influence the accident.
As the movie was progressing since the father didn't experience any supernatural events until the seance I was theorizing that the family had mental issues or sensitive to spiritual world inherited from mother's side (hence the movie's title).