Why not get your little girl a notebook for school that will remind her to put on the armor of God? This notebook was specially designed for girls using Ephesians 6 as inspiration.
“Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand firm. 14 Stand therefore, having fastened on the belt of truth, and having put on the breastplate of righteousness, 15 and, as shoes for your feet, having put on the readiness given by the gospel of peace. 16 In all circumstances take up the shield of faith, with which you can extinguish all the flaming darts of the evil one; 17 and take the helmet of salvation, and the sword of the Spirit, which is the word of God,”
This is an 8 x 10 wide-ruled notebook that can be used for school, journaling, taking notes at church, etc. Regardless of how she uses it, your little girl is sure to fall in love with it.