kids gymnastics leotard ballet (Prince of Wales and Baseline)

My granddaughter is autistic and wears a diaper that she can't stop digging into. My daughter has discovered these gymnastic leotards with shorts or the long legged ones work well to keep her from reaching her diaper. She is aprox size 7 - 8. Anything around that size would work. Thank you for any help possible! Merry Christmas everyone ; )