You will never make everyone happy so don't even try. There is always going to be one or two parents that will always be unhappy, that's just life. You said that you have been there with your own daughter but you went from one extreme to another. All outfield to all infield, so one of the reasons you didn't get any sleep was because you knew that some of what the parents were saying is true. This is your first year coaching and we all know it's not easy, so that a deep breath and don't go from one extreme to another. Mix some of the players in slowly and move some of the infielders to the outfield. The most important thing you can do is not turn any of the players off to the game of softball. That happens enough on it's own.