The K2 Kat youth snowboard boots are perfect for your sized 3 7 little shred lady. Let her tighten up her own boots quickly and easily with Boa(R) dial lacing. A Intuition(R) Comfort Foam STD EVA Liner will keep her tootsies cozy and her ankles supported and K2's Grows A LongTM Shims allow her boots to grow with her so you won't have to drop in on a new pair again next season.