Surfref
PREMIER
My daughter would forgo the shin guards if she could. Speed and quickness is something she has and doesn't want to give up. She plays basketball and takes more bumps and bruises there then she has at keeper, including hits to the head on rebounds. Pretty much every girl that keeps playing as they get older is going to go head to head with other girls on the field as they try to head the ball, so if head gear is required it should be for everyone.
Just get her a good light weight shin guard. I played youth soccer in the late 70’s when shin guards were optional and the shin guards provided very little protection. I saw several players suffer severe bone bruises or fractures of the shin when not wearing shin guards. A good pair of shin guards is essential for player safety.
I bet within a few years head gear for youth players will be mandatory in the USA.