IMHO this is not a boy/girl issue. its a dominante player issue. If the league is a competive league she should be allowed to play and crush. If its an skills , educational or Rec league it can be difficult. If you have one player that totally dominates all others the others don't always have a chance to learn better skills or participate. But heres the thing as long as she is passing and working with her team mates who the heck cares. Its not like they play the same opponent every time. Ya gotta play against better players to get better.
My daughter plays Lacrosse. Last year they went undefeated this year the commissioner decided to schedual them against tougher teams. They are loosing quite a few games but guess what! Her skills and play are improving.
anyway I don't so much as fault the league as the whiney parents.