Prob because there's a psycopath with a saw that just cut someone in half standing next to them.
Well, it's OBVIOUS Maggie aint' a contortionist so she can't fit herself into the one half of the box, so WHY WOULD THEY LET HER DO IT and then why ain't they STOP HIM WHEN SHE START SCREAMING SINCE SHE'S OBVIOUSLY GOING TO CUZ GETTING SAWED IN HALF TENDS TO BE PAINFUL?