In the 'Emily Rose Story', Emily Rose is a girl who has to endure the horror of being possessed. She is the one that everyone in the story is either trying to help or figure out what's wrong with. Her experiences are what drive the whole story forward.
The story of Emily Rose is mostly a creation for entertainment or to convey certain themes. There's no concrete evidence to suggest it's an actual real-life event. It could draw from common fears or myths but doesn't have a factual basis.
Well, sort of. While the movie 'Emily Rose' takes elements from a real event, it also adds fictional elements for dramatic effect. So, it's a blend of reality and creativity.
It is a very complex and poignant story. The main character, Emily, is a symbol of the old South. Her life is full of isolation and mystery. The use of the rose in the title can be seen as a symbol of love, pity or a tribute to her in a way.