Replacement Shooter

[Diesel]

After reading the earlier thread about when a FT shooter can be replaced, a situation popped up in one of my girls' games.

A1 is shooting the of two first free-throws after being fouled on a shot attempt and makes it. I am administering the shots and when I go to pass the ball for A1's second shot, my partner blows his whistle and tell the A1's coach that we need a replacement shooter because A1 has a metal clip in her hair. So the coach sends in A2 to shoot the free-throw and A1 sits on the bench. A2 misses and we play on from there and nobody in the gym seems to care or know why we did what we did.

Before the game started, we had reminded both coaches and captains that no metal could be in their hair after we had seen multiple players with the metal clips.

If I noticed a metal clip in A1's hair, I would have let her finish the free-throw and then stop the game to get her out just to avoid any headaches with the rules.

Does this fall under safety issues or an improperly equipped player? I've been searching and can't seem to find anything that validates or invalidates what we did.