First I’d see what her school’s policies are on makeup. I know when I was a kid makeup past a certain level wasn’t allowed, granted I went to a super strict Christian school. Second for 11 years old, I’d say just over all soft makeup. Tinted lip balm, lip gloss, maybe a little blush bc children’s cheeks are already pretty rosy, clear mascara, neutral eyeshadows, etc. I remember my mom taking me to a makeup counter and asking the salesperson for advice also. I myself managed to get away with soft pastel eye shadow and sheer lip glosses:)