I'm pretty sure it was suppose to be just a regular doll. Brock, Misty and Sabrina's mother still looked like themselves and they could talk somehow, but the one in the tub looked like a typical doll and didn't talk. The way it turned around was probably due to Sabrina's psychic powers. The way she treated Ash and his friends does beg the question of how many other trainers she potentially killed by turning them into play thing, which also makes one wonder how she could still be a Gym Leader or why she would want to be actually when she seemed more interested in just using her powers against others for the amusement of her child self.

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