Hi Ashley, we are sorry to hear you received a duplicate in your order! Unfortunately there is no way to prevent this if ordering online, as it does come from an assortment however we do understand your disappointment. Hopefully your niece doesn't mind or perhaps she may even be able to trade it or give it as a gift to a friend! If you have any questions or concerns, please reach out to our Customer Care team at 1 800 622 8339 and one of our agents can assist you directly. Thank you!