Lingering nitpick questions (American version)

If Rachel made a copy of the tape early on making her not actually marked for death...why was she still seeing visions, having nightmares, got the burn mark, horses fear her, has blurry photo face, etc? Does this happen to anyone who watches the tape for the next 7 days regardless? Or beyond 7 days? Forever?

Also, in terms of the drawings her son does of his cousin BEFORE she actually dies that his teacher shows Rachel...is this because the cousin talked to him about it beforehand? Or there's just a lot of kids in this movie with psychic abilities and our main character just happens to also have a son that has them too?