I've been in a similar situation before, and while I agree with 2B, 3B, and C, I tend to think that the outfielders are the most important position in softball. If a ball gets by someone, it means triple or home-run for sure with those 60 ft bases. This goes for anyone that isn't as strong as a player, not just the girls. Judging a high fly ball is one of those things that you have to do hundreds of times before you really read them well, so sticking someone in the outfield with little experience is a bad idea. What my team does, is play 3 "normal" outfielders and have 2 "short" outfielders. 2 girls usually hold down the short spots. They've had a lot of success in this role so far, and even if they do make a mistake it usually only means a pop-out turned into a single.