[WP] Help with my FNAF rewrite?

So I've been trying to rewrite the Five Nights At Freddy's novel trilogy while adding more elements from the games those books were inspired and including references to various online horror stories. I've changed several plot details in hopes of correcting what I saw as flaws in the original trilogy, most of which I'm fairly confident with. But one thing I'm having trouble settling on is the main character's motives in the first story. For those who aren't familiar with the FNAF novels, I'll explain the plot of the first book, The Silver Eyes, first:

The Silver Eyes follows a teenage girl named Charlie Emily who's visiting her hometown after being away for ten years to attend the launch of a scholarship created in the name of one of her childhood friends, Michael brooks, who was abducted when when she was seven. Along with four other kids. Before I go further into that, let me tell you about Charlie's father, Henry. Henry owned a children's pizzeria that featured a handful of animatronics. He opened the place with his business partner, William Afton, who ended up killing five kids during the mid-80s and stuffing their bodies into robotic mascots suits. William was never caught, Henry killed himself, the pizzeria was shut down, and the souls of William's victims ended up haunting the animatronics. Charlie went to live with her Aunt Jen after that. Anyways, Charlie meets up with some friends she used to play with at her dad's restaurant who were also invited and they decide to explore the place's remains. After Henry's death, plans were made to build a mall over it, which they started to do, to attract a few more businesses for the town. It didn't work. Some business owners came from outside of town to check things out, but nobody wanted the property after hearing about the kids.

The mall's construction was abandoned before the building was even complete. And it was left that way until Charlie's return. Anyway, the group explores the pizzeria a handful of times, with the experience triggering repressed memories for Charlie, and learn that William was there with another identity. Working as a night guard named Dave Miller. He kidnaps the police chief's son and the return the next night to save him, only to be attacked by the animatronics. William ends up getting crushed by the mechanical rabbit suit he wore and by Charlie triggering the locks inside that kept the animatronics parts compressed so the costume was wearable. Yeah, the way I'm describing the book doesn't do it much justice, but it's actually not awful. The sequels, however...are worse. But that's besides the point of my post. The reason I'm posting this is because I'd like someone's help with picking another reason for Charlie to return home and explore the pizzeria. Partly because I don't want my version to feel like a carbon-copy and partly because I'd like giving her a scenario that feels more faithful to the premise of the games.

If you don't know, the original FNAF game follows a night guard working for six hours a night at the restaurant where he's forced to survive the animatronic attacks. He's later revealed through context clues to be Michael Afton, the son of William, trying to free his victims. For whatever reason, the novels don't really touch upon that survival theme. I don't even think Charlie and her friends even pay five visits to the restaurant. I was hoping someone here could offer alternative suggestions for Charlie to return, ideally with her having some kind of mundane job that puts her in close contact with the place. Obviously not a security guard though because...well, she's a teenage girl. The whole sub-plot of the Brooks family inviting her and her friends still happens, but I don't want that to be her main motive for coming back. I'd appreciate some outside ideas. Oh, and this also seems relevant here:

In the original book, Henry's entire business shuts down after his suicide. But in my story, the business is taken over by his wife, who tries opening more restaurants elsewhere to salvage her husband's memory to some degree. I'd imagine that alteration opens more potential doors for Charlie's story, but I haven't thought of many specific ones. I've been more busy with writing for important events taking place at the other pizza joints.