You lead her to the basement door. You say, Sweetie, you still want that naval pierced? You say, come on down the basement for a minute. Take her down to your workshop, pick up the biggest, rustiest nail you can find and a big hammer. Then say, "sit right down..."

It worked for me with my ears... I waited a whole nuther year after my Dad scared me like that.

My gut reaction? Say no. Tell her in two more years she'll be eighteen and can then have it done.