Take a look at this idea for [tag]coaching girls softball[/tag] from Christy, one of my subscribers. This is a great suggestion that can work with all age groups.
A simple [tag]softball throwing drill[/tag] to work on strength and accuracy:
A line at each base, catchers and pitchers at home, who throw to second (second and short), who throw to third (third and out), who throw to first (first). 
We do this [tag]softball drill[/tag] throughout the season, having a goal of how many cycles we can do without dropping it. If the [tag]softball[/tag] drops it starts over at home. The players rotate through their line as they throw. We increase the number of cycles as we become successful.