This is definitely an Amy Seimetz film ... she wrote it, produced it, and directed it. She was dealing with her own anxiety issues and says "I was spreading my panic to other people by talking about it perhaps too excessively." That she took her own situation and turned it into a movie we can all relate to is an achievement in itself. That it comes to us during the pandemic, which she could not have predicted, and becomes a movie eerily appropriate for our time is a mystery.
She Dies Tomorrow can be frustrating ... just ask my wife, who watched with me but did not, it is safe to say, warm to it. The first part of the film is confusing even for those of us who liked it. Nothing seems to be happening, there is precious little dialogue, the camerawork is quirky for no clear reason. If you came in thinking you were watching a horror movie, you'd probably be checking your watch.
But She Dies Tomorrow sneaks up on you. First we learn the basic premise ... well, "first" is a bit of an exaggeration considering how long it takes to get us there. Then, after a short while, we learn the real premise, which will connect with those horror fans who are still with us. And when that real premise begins to expand, I admit I was laughing. If I had to put this movie into a genre, I might choose Comedy before everything else.
Of course, you can't put it into a single genre, because Seimetz is using a kitchen sink approach to genre. She isn't trashing genres, not at all. She just isn't limited by genre.
And so a character feels anxiety. And it spreads to other people. There are hints of Invasion of the Body Snatchers. And it feels very familiar to anyone watching in 2020.
Plus, as Kurt said, just because you're paranoid don't mean they're not after you. Seimetz leaves everything unexplained. Absent the easy answers, we can dismiss what we are feeling. But the anxiety of watching She Dies Tomorrow doesn't leave you.