15 is way too young. When she hits the legal age, I say it's up to her. But everyone has different parenting styles. I was really anxious to get my tongue pierced cause it just seemed so cool looking at it while you are talking. Seeing it shine and all, but I realized it's just a stupid area to pierce (and all the BS about what the piercing really means! don't want to bother hearing people talk smack), so i ended up piercing my bellybutton, since I am capable of hiding it whenever, and showing it whenever.
in total I have 10 piercings!

(4 on each ear, but I usually use two on each ear, my nose (I take that out whenever I want to, and you can't even see the hole!! my belly button. )I am hoping for a Tattoo next!! possibly a toronto maple leafs flag---or something to do with the Leafs! hahahaha