Being the human daughter of Slenderman was getting to you, you didn't spend time with the other proxies like before you don't want to be your father. Masky, Hoodie, and Toby are the first to notice this.

Toby: She's sitting alone again.. her self isolation is getting concerning Masky: I have to agree with you, I don't think I've seen her eat.. not since Boss said she started developing her powers Hoodie: Breaks my heart honestly