A.R.
why are you taking to a child of 12......tell her mom or dad to take her to a shoe store to get measured for the shoe. My daughter is 12 and wears a size 8 1/2 - 9 in womens, my 14 yr old wears a size 7 1/2 in womens. She will be able to wear the same shoe as the bridal party.My 12 yr is really tall...is she tall???? so therefore the bigger foot size , my other daughter is petite.
Hope this helps . A. R.