A crucifix necklace or a wall-mounted crucifix are traditional confirmation gifts for girls. For something a little different, there are music boxes that play hymns.
Christian-themed jewelry is a traditional choice for girls, with many charm bracelets, necklaces, rings or earrings available. Popular styles include the crucifix, a dove, or saint medals for Catholics. Some people like to get something with the child's birthstone in it for a more personalized gift.
Keepsake boxes and music boxes are a popular trend. Most have religious symbols or sayings carved into them. If the girl has a favorite hymn, it might be worth looking for a music box that plays it. Check with other family members to avoid giving her the same thing.