Are they high number of injuries you're referring to a direct relation to being hit by a shot?
I have 2 daughters playing and have yet to see a serious injury (keep someone out of the game) from a shot.
Lack of shooting space calls leads directly to injuries such as being hit in the face or body by the ball or the stick during the follow through. If you watched the women's D1 finals the UNC girls face was bloodied from a shot. I don't know how old your 2 girls are but it happens a lot. Count your blessings.
