L.A.
Will she wear a bracelet? I got a custom stamped one for my son here, it says emergency and our phone number:
The cord doesn't stay on, but you could tie it with a ribbon instead:
http://www.etsy.com/view_listing.php?listing_id=12283469
Or, you can do this, but I don't know that people would think of the numbers as being a phone number:
http://www.etsy.com/view_listing.php?listing_id=9570477
This is what I found for the tattoo, what a great idea!
http://www.mypreciouskid.com/temporary-tattoos.html