Just deleivered Zara Black Ruffle Sleeve Bodysuit - Size 13

Black bodysuit from Zara with studded ruffle sleeves. Size 13, suitable for 12-13 year olds. Ribbed material. Just delivered but it is small sizd for myb12 years old it fits more like for 9 to 10. I ordered online I did not know its final sale and i cannot return it.