Depends which form of Hockey you are referring to, as most people refer to whichever they have most experience of as 'hockey'. Theres Ice hockey, field hockey and skater hockey all of which I know fairly well. Field hockey is appalling and I shall never forgive them for forcing me to play it at school. Ice hockey is great, not that I'd ever play - someone would probably kill me! Skater hockey is kinda middling.
From whjat I saw, girls tend to do well at that kind of age in skater and ice hockey cause the boys are too scared to hit them, but the girls are quite happy to play dirty