Mrs. Sanderson was a resident of Addison Apartments and used to live in Room 403 prior to her gruesome murder.
She appears as a corpse in the very first chapter, "Strange Neighbours", and as a ghost in the second.
Not much is known about her personality before her death as she was the first character in the game to die, other than the fact that she seemed very caring and polite.
In the video game Seeking Providence, she appears exclusively in chapter 8 as a sprite. In said chapter, she displays considerable bravery dodging the cultists to retrieve the tome, an endeavor in which she succeeds in before her grisly murder at the hands of a possessed Charley Mansfield.
Mrs. Sanderson appears to be a light-skinned woman in her late forties to early fifties. She wears a pink dress reaching just below her knees, as well as purple nail polish and purple earrings; both of which match the color of her abnormal large eyes.
Her hair is curly and green, in contrast to the rest of her outfit. She is seen wearing dark blue slippers.
As a ghost, her clothes are bloodied and her throat slit (it is through said slit that she can speak).
Prior to her husband's involvement with the local cult, Mrs. Sanderson was a happily married woman who collected Glitter Ponies and made friends with the local residents of Addison Appartments.
Upon learning of her husband's dealings, Sanderson stole a sacred tome from the cultists, desperate for answers. It was an unknown amount of time later that she reached out to Larry Johnson for some assistance with her plumbing. When Larry finished his task he bore witness to Sanderson's grizzly slaughter at the hands of Charley.
Her corpse is later seen in the coroner's truck with a giant slit in her throat and a fracture across the top of her skull.
Following the arrest of Charley and the coming of winter in Addison Apartments, Sandy receives a visitor in the form of Sal Fisher. She shares with the boy her fear of Red Eyes and her regret of her husband's involvement with the Devourers of God before being scared off by the aforementioned entity.
When Red-Eyes became inactive after Larry's intervention in Room 504, Sandy (alongside the other ghosts of the apartment complex) became a lot more open and social with Sal, doing her best to stave off perpetual boredom.
On the day of the Bologna Incident, Sandy gifts Sal a letter from an unknown sender (likely the Phantom AKA Jim Johnson) before vanishing back into the confines of her former home.
Like the rest of the ghosts, Sanderson vanished the day of the Red-Eyes Infestation.
- Her first name, Sandy, was revealed in the Super Gear Boy during Chapter 8.
- Sandy is playable in Chapter 8 of Seeking Providence