According to the Halachah there was never an Issur for a woman to pierce her nose. In fact according to the Chasam Sofer, a man may also do so nowadays since men do so. (the Chasam Sofer says that we would go after the non-jewish men in this instance even though the Jewish men don’t normally pierce their ears or nose. Which is why the Chasam Sofer would hold a man may dye his hair as well since the non-jewish men do so.