As most of the garments are designed to stretch we suggest you choose the size to fit the Jordi girl now. You do not need to allow “room to grow”.
For a more compression fit or for more “support” go smaller.
The black running shorts with zip are not as stretchy and are slim fit so please take that into account when choosing the size.
Girls 12 For the tween and petite teen
Girls 14 True to size regular G14
Ladies 6/8 Generous fit for smaller frame
Ladies 10/12 Generous fit for taller, broader frame