Only in a perfect world would every check or challenge that's made be of the legal sort. You are naive if you think that girls lacrosse is non-contact. It's why they assess fouls and cards. Taking a charge is legal and that can certainly be full contact. Shoulder to shoulder contact is legal. Forget all the calls that go unseen or the cross checks referees allow the girls to play through. Every girl who plays at a high level is used to going home with bruises on her arm after every practice and game.