rybo gave you a good answer. Play with complete arrow weight, in order to maximize Kinetic energy without sacrificing to much speed. Rib cage you may get a pass through, if you are set on a pass through remember to use a smaller diameter fixed blade, for less chance of catching bone. Any shoulder bone involved you will not have a pass through. Even pulling 70lbs guys dont always pass through the shoulder blade. Good luck, it is awesome to see a father teaching his daughter, or child archery and getting them involved in hunting. It teaches worlds of responsibilty and respect. Kudos to you and kudos to your daughter for enjoying it.