RIP Essie - Tumblr Posts

I’m on season 5 episode two of the white vault, I’m assuming that the documentarian and her family are the “people from the light” that doctor Liu’s notes were about. I think that the documentarian’s half sister Essie was going to reveal what was going on with the sites and that is why she was killed, specifically because of the way that the documentarian’s mother had mentioned her regrets regarding Essie (presumably an argument between the two relating to the sites that resulted in the car accident). Also the mother had said “there are no such things as accidents” regarding the car accident that killed her which I think speaks for itself. Anyways, thoughts?