@socowonder, At the risk of sounding like my parents, I really don’t understand why girls these days think they get their power from body-revealing clothing. I see teen girls as particularly vulnerable and targeted by very sophisticated messaging. It can get them to do things that aren’t in their best interest and they can’t undo once done. I have no idea how to navigate that treacherous territory. Opting out is not really an option these days. WWGSD (What Would Gloria Steinem Do)?
The only thing I can think of is to be honest about it, educate yourself, keep your standards, and if you can, make it work for you rather than against you. (I was going to say “make it your b!#&@”, but that word is probably against message 
).
I am super curious what a smart, enlightened budding feminist does with this opportunity. I have faith that you and she have your heads screwed on tightly and will make good decisions for all of you.