I'm not sure specifically which 'Jennifer Williams My True Crime Story' you are referring to. There could be many individuals named Jennifer Williams. It might be a personal account of a crime she was involved in, either as a victim or in some other capacity.
Hard to say. To determine if it's a true story, we'd need to know more details about the origin and sources related to Jennifer Grayson. Sometimes stories are inspired by real life but have fictional elements added.
Well, without more specific information about 'my true crime story', it's hard to say exactly. It could be a mix of actors, detectives involved in the real - life case if it's based on one, witnesses perhaps played by actors, and the criminals themselves (if they are being re - enacted).