I have a daughter that plays university hockey , now in her 4th season. Why no body checking ? Simple, the huge disparity in size between the biggest and smallest player. University teams usually carry about 23-25 players and if someone is injured then it's up to the players who don't dress. My daughters team only had one goalie at a tournament because the backup was hurt. 
Some girls love to hit, most don't . It's a hard sell at the minor level to convince mothers that it's a good idea to let the girls hit each other. Most mothers have never played hockey ( or sports) and to the uninitiated hitting looks primitive.