To add to the above advice, I'd like to say this. When the girls go to the floor after the ball (as they love to do) make sure you're not too quick with your whistle. Hesitate, make sure both (opposing) players have their hands on the ball, then blow it.
Other than that, call it the same as you would a boys game. The coaches want that, the players deserve that. All too often we gentlemen
tend to call the ladies too tight. Let em play and enjoy the game...