On the first point, she’s proven wrong, but proven right on the second point when she shakes Chucky, yelling at him to talk. She then notices that, technically, the doll shouldn’t be able to ...
The justice system thinks that Nica was behind the slayings, when, in reality, it was the possessed Good Guys doll. Eventually, Chucky finds his way back to Nica and all hell breaks loose…again.