I saw it on tv, mid 90’s and colorful. The story takes place in the desert. There’s a group of friends spending their vacations (possibly). One of their group, a blonde woman witnesses her friends ‘s deaths as they die one by one on a really weird, twisted and gory way. The woman thinks someone stranger does that, but at the end she finds out that she killed them by herself all along. I remember a skeleton with flesh on it, a head that she held it in her hands and turning it round and round and a head half buried in the sand, covered with a white sheet that she later uncovered. The movie was american, shown in Greece, on tv and its title in Greek was translated as Η αυταπάτη = The Delusion.