Indeed, she should ignore them. If she obeys you, she is not free of blame. She cannot try to justify her attitude in front of Allah, on the day of judgment, by saying that she only obeyed you as a Muslim woman should obey her husband. Exposing her head in public constitutes such a disobedience. Hence, she may not obey you in that.
Islamic dress is Islamic and it applies to all Muslim women.
Those who wear it are virtuous, God-fearing, obedient Muslim women. They should be respected and congratulated on their efforts. Having said that, my advice to you is to adopt a more understanding attitude. You should cooperate with your wife so that your family life is free of tension and pressure and the like. You should try to understand each other's point of view.