A:
A woman should wear Hijab in front of Ajanib (men other than a husband or permanently unmarriageable male relatives), not to stay alone with them, and behaves with proper decorum and modesty, whether she happens to be performing Hajj or anything else.
Hajj is not invalidated if the woman displays her face in front of Ajanib out of her belief that a woman in a state of Ihram (ritual state for Hajj or `Umrah) should not cover her face. However, she will be considered as having committed a prohibited act by displaying her face in front of Ajanib. She will be held sinful for doing so. She must turn to Allah in sincere repentance and offer many voluntary acts of `Ibadah (worship) while humbling herself before Allah, asking for His forgiveness that He may accept her Tawbah (repentance) and pardon her sin.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.