On days when I was the only coach on site it was hard to keep all the girls working hard for the entire practice time. One way of keeping them busy was to set up skills drill time.   This way the girls do position specific drills and I can then just move from position to position and encourage or demonstrate and adjust the drill.

Outfielder Drill
One drill that I like specifically was an outfielder drill.
Place 5 or 6 softballs 50 to 60 feet from a wall in a line parallel to the wall.
Have the player start at the wall and run to the first ball pick it up and throw to the wall.
Then move down the line for the other 4 or 5 balls; it is not necessary to go back to start.
When all six balls have been played they will all be lying in front of the wall about 20 to 30 feet from the wall, she will then run up to the one closest to her and start the process again.

Now on the wall I drew a cut person (sort of) that gives her the target to throw to.

This drill worked out well and the proof was the player assisted on throw out at 3rd. The ball, in an important game, was hit to her in right field, she fielded the ball properly and made a good throw to her cut who then relayed the throw to 3rd and caught the runner by a foot.

This drill can be used with what I call a bounce back net as well. If the throw goes to a cut person (the net) will cause the ball to come back as a grounder. If the throw is too low the ball will come back in the air and if she misses the net and the runner is safe because we missed the cut person.