The 'Hannah Grace True Story' could refer to various things. Without more context, it's hard to be specific. It might be a personal account of someone named Hannah Grace, perhaps her life experiences, achievements, or a particular event she was involved in.
There is no conclusive evidence to prove that the Hannah Grace exorcism is a real story. Many so - called exorcism stories often turn out to be a mix of superstition, psychological factors, and sometimes even hoaxes. Without proper verification from reliable sources, it's hard to take it as a real event.
Well, it is indeed a true story. The movie or the account of 'Hannah Grace's Possession' takes elements from actual happenings. This allows it to have a sense of authenticity which adds to the overall chilling effect. For example, some of the details about the possession might be inspired by real - life cases of alleged possessions in history, which makes it more believable and scarier for the viewers.
The origins might be in some form of urban legend or a fictional account that got passed around. It could have started from someone's made - up story which then spread through word - of - mouth or the internet.