I totally and 100% agree with Mimi.

I don't have children, but I was a teenage girl once and I remember it well. My parents did an outstanding job of educating me and letting me make my own choices, and as much as it was 'cool' to put down the 'rents back then...I could never chime in. Mine were just TOO fair and I turned out pretty damn well (if I do say so myself!). I learned both from the mistakes I made, and also from the ones they helped me avoid!

Your daughter sounds like a responsible and mature 16-year old. In my opinion, I think you both should express how you feel about this to her and then tell her the decision is her's to make. And be sure to let her know how much you appreciate her being upfront about this - it'll go a long way when the bigger issues come up down the road.