I can see you haven't had too many 8 year old girls shooting archery equipment.
No I haven't but don't start your kids off with to heavy of a bow when there young. I've got a ton of little recurve's and longbows that my brother and I used as kids. We were 3 years old when we started and any little girl out there would of had a blast with these things and pull them back just fine. These bows were lucky If they were 5lbs. Anyone can do It, It just takes time and the right preparation.