Why did it automatically have to become a feminist issue? I feel a tiny bit sorry for her tbh, I bet she does wish she hadn't asked!
At 12 I would hope she hasn't seen anything like porn yet!
I shave, and it is a matter of personal preference, nothing to do with pleasing dh. I prefer it, feels cleaner. If my dd asks, I will tell her simply it is her body and her choice. My dd is 14 btw, quite hairy legs, etc, and most certainly wouldn't hear of shaving them! It's her choice. :)