At this age, or older, my best idea is to use wrist supports (like for RSI/carpal tunnel) which have that steel spoon insert, and adjust my grips to compensate for the wrist braces. If you're worried that carpal tunnel is in your family history, MENTION it to the PT in particular; they will probably make a point of teaching Cordelia best practices, and remind her to do stretching and wrist flexes during her day. Make a habit now to use the same stretches suggested for RSI and heavy typing every time she gets home and puts her leg up after school, and again at some point after dinner. Twice a day when she has no visible NEED for the exercises nevertheless gives her both the skills/information she needs AND and easy habit she can take for granted as much as brushing her teeth or combing her hair.