Alzheimer's is way scarier than any possession could ever be
That's why it's so disappointing the movie doesn't make much of it. The woman goes from a nice old lady to a zombie who creeps everyone out within a few minutes. Almost no scenes where she appears halfway normal after that, no scenes where we see her and her daughter's struggle, where we can watch her mind and her personality slowly disintegrate.
The disease is just an excuse to bring on the usual possession related jump scares. It's competently made, but it feels like a wasted opportunity, because possession is not that bad of a metaphor for Alzheimer's. It also didn't really need the found footage treatment imho. Wouldn't this movie, filmed in a more traditional style and with more focus on it's subject matter and the personalities of the characters be a lot more interesting and unique? I'd say it would have been worth a try, especially since there are two perfectly capable actresses (the woman and the daughter) who easily could have handled more nuanced material.