2 things:
1) The play isn't over just because you make an out in the field. If you don't know where to throw the ball - cutoffs, lead runner, etc., teams will run all over you. First to third on a bunt or a ground out, delayed steals, second to home on a ground out, just taking extra bases. Know what you are doing with the ball at all times.
2) Pitchers need speed or spin. At 10U the biggest concern is throwing strikes. Not to say that isn't important at 12U, but girls will crush strikes if you don't have speed or spin. A girl that can throw change ups for strikes is a valuable asset.
Of course, there is also dropped third strike and tagging up to make sure they know about.
1) The play isn't over just because you make an out in the field. If you don't know where to throw the ball - cutoffs, lead runner, etc., teams will run all over you. First to third on a bunt or a ground out, delayed steals, second to home on a ground out, just taking extra bases. Know what you are doing with the ball at all times.
2) Pitchers need speed or spin. At 10U the biggest concern is throwing strikes. Not to say that isn't important at 12U, but girls will crush strikes if you don't have speed or spin. A girl that can throw change ups for strikes is a valuable asset.
Of course, there is also dropped third strike and tagging up to make sure they know about.