>>41290563 (OP)
Someone in the house did it and then they concealed it, most people believe it was the brother who has a history of violent behavior.
Eerily similar to the Paulette Gerbara case in Mexico, the girl is missing for a week, mom makes the rounds on the news fake crying, people in the condo start complaining about a bad smell in the laundry chute, odor disappears the day before the girl's body is mysteriously found between her matress and the bed sheets, right on the same bed where the mom had been giving interviews, in the same room that had been searched tirestly by the nanny, the police and k9 units.
Everyone knows the mom did (The nanny testified the mom hated the girl) it and the dad helped her move the body around the building, bur of course nobody ever got arrested because they're rich.