Sorry, no help here. DD is only 11 and is very conservative/modest. I'm still living in the old days too and we're Pentacostal so that makes a big difference. She's taught at home and at church not to show off her body or to wear makeup. It's very hard these days to draw a line. Perhaps if you offered some makeup tips? The old "Less is more" thing. Or, remembering my own childhood, she might just be trying to get a rise out of you with shock factor. Praise her for being a conformist and being willing to follow the crowd rather than to be her own person. It might work, better than fighting anyway. I think it's called reverse psychology. Just don't overdo it, be rather nonchalant about it.