Getting a better follow-through on throws
Throwing is one of those odd things that seems like it should be natural, but for many girls it’s not. For whatever reason they tend to use their arms only instead of following through completely for maximum power. When they do receive some instruction on following through it gets somewhat better, but often it is awkward as well.
One way to try to get a better follow-through is to have them replace the front shoulder with the back shoulder. In other words, when they throw, their throwing-side shoulder should finish where the glove side shoulder started. This is assuming, of course, that they turned sideways to begin the throw.
Once they get the idea of shoulder follow-through, you can also have them bring their back leg in line with the front leg. This complete use of the body should have them gaining more power and speed, and better accuracy too.