In Gypsy Rose Blanchard's real story, first of all, Dee Dee's continuous deception about Gypsy's health was crucial. This involved making Gypsy believe she had things like muscular dystrophy and epilepsy when she didn't. Then, Gypsy's discovery through the Internet that her life was a lie was significant. She started to rebel against her mother's control. And ultimately, the event of her mother's death, which was the culmination of all the built - up issues between them, is a very key event in this complex and tragic story.
The key event was her mother's faking of her illnesses. Another was Gypsy's meeting someone online who influenced her actions against her mother. And finally, the murder of her mother.
One key event was that Gypsy was made to live as a very ill person, with false medical records. Then, she managed to communicate with someone outside her mother's control, which was a turning point. Eventually, she took part in the act that led to her mother's death, which is a major event in this story.