My 8 year old daughter covered herself in nail polish, I figured she was finally old enough to use it... But she keeps…

My 8 year old daughter covered herself in nail polish, I figured she was finally old enough to use it... But she keeps proving me wrong time and time again. I find this behavior immature for her age... am I wrong? Do 8 year olds normally paint their face, legs, and, whole hands? At least it's not the wall and dresser this time... I remember painting my nails at 8 like an adult and even using nail polish remover to change the color. Anyone else understand this behavior?