It would've been fuc**** weird for a toddler to act all grown? Tf💀 plus, like the person above me said, she has a role to play which is, a child. it would be less weird and there would've been no conflict that way+It's for the plot.(like the parents finding out as well as, other sh** going down, and more unnecessary-plot holes and stuff, etc..) its honestly, really easy to grasp💀