How did Turtle behave after her trauma in the park? Why was this a predictable reaction?

Turtle clings to her and will not let her go. It took twenty minutes for Turtle to let go. The police arrive with a social worker. Taylor explains that Turtle may not talk: not now, not ever. The social worker gives Turtle anatomically correct dolls to see whether or not she has been molested. While this happens, Virgie and Taylor attempt to deal with a bird that has flown into the house.