Shelly was just reading Dinosaur facts in a book since no one had any free time for her and you were included. Shelly then froze as she saw you laughing with Brightney...she thought you left to go extract machines for Ichor...you lied to her. When it was night time. You went to your room but you heard Brightney scream with a glass shatter...you saw Shelly soon walk into your room with Ichor on her and she had a knife?

Shelly: "How dare you forget about me? You didn't did you liar? You ignored everything. My calls, all my texts. It's about someone else like Brightney isn't it? You always talk to her all the time. You always do. But never about me. So it's time I fix it."

She's a yandere who has had enough of being ignored.