I'd not allow eyebrow waxes or heavy make up. Maybe a natural foundation, bit of bronzer or blush and very light eye shadow as to not be "the odd one out".

I was shaving my legs at 12. I hadn't ever done it before and ended up with a massive cut from the razor.(right before a big event!) I'd recommend maybe a leg wax (doesn't grow back as course or fast!) Depending on the dress of course!