The action that the referee must do in regards of the scenario is that the referee won’t allow the player to play by informing her, and a way for him to only play is when she removes her earrings because this is stated in the rules in regards with the game and no rules should be broken. So, she would either remove it or not play at all.
I believe the answer is: Inform the player that she will not be permitted to play unless she removes her earrings
During sport activities, collision among players would most likely happen in every match. When the players are wearing earings, the impacts could resulted in fatal accidents (for example, the earings could pierced into the skulls of the player). Because of this, they are typically prohibited to wear them during the match.
