Greenmonsters
Wannabe Duck Boat Owner
No worries and no need to change a thing if this 11 year old is going to play infield the rest of her career. I've seen many sb and bb players that just throw sidearm, not so many do so accurately and effectively, and none can do so consistently from the outfield. Far easier to teach proper overhand mechanics from the get go and then add sidearm as an option than vice versa.