does anyone know what tribe sherilyn is from? what rez her grandmother would have lived on if she did live on the rez?
as for the spirits they saw, maybe that led to their obsession with death or vice versa? i don't think that they were obsessed with death in a negative way as in suicidal, yet i think maybe their view of it was more new age. as in what happens after we die? how to interact with the spirit world. i wish we could see the letters that indicated they were death obsessed. sometimes i think it's in the eye of the beholder, as the picture of madyson.
when we compare the pic of madyson that day to other pics of her it really can be intrepreted as to how one wants to see it.
also lighting plays a huge factor in photos. so does camera quality. here's a link to several pics of madyson from charleyproject
http://www.charleyproject.org/cases/j/jamison_madyson.html
the pic of mady from that day isn't so different from the pic of her on the lower right hand corner. her face angle is slightly different in them and so is the lighting and the way the light cast can make shadows. also at this point i doubt the jamisons or an evil person would stop whatever it was they were doing to take a pic of madyson to leave on the camera. so it's likely the pic happened prior to any wrongdoing.