you can scrap #3, the crop and not being able to see her face or anyone else in the shot kinda kills it
With softball you have one main thing going for you, you own a 70-200 2.8 and at the next game, take it and shoot right from behind home plate when they are on the field. The lens will focus pretty well through chain link if you are right up on it, and at 200mm you can track the running coming in from 3rd, short stop and first base positions pretty well. As well as get some great pitcher shots. Those girls show a lot of emotion in games, be sure to keep an eye out for that. Also during batting, if you dont have a good angle or already have a shot that will do, shoot the dugout, team spirit is high and you can get some great shots.
Also, I was allowed on the field during College Softballl season last year, not that it was the greatest spot, but if I wanted to just hang out and wait for a right fielder to do something, I would ask the ref before the game and usually they would give me permission to be on the good side of the fence around the mid-outfield. Of course I was on assignment so that might have made some sway with the ump.