Is it better for a woman to do a naafil Hajj even though she is exposed to crowding with men?
Question

                You are well aware of the fact that when women go to Hajj they are faced with crowding and mixing with men during tawaaf and saa’i and at other holy sites. Is it better for women who have done the obligatory Hajj to repeat Hajj, or should they be content with the obligatory Hajj?.
Praise be to Allah.Shaykh Ibn Baaz (may Allaah have mercy on 
    him) said:
 Undoubtedly repeating Hajj brings great 
    virtue for both men and woman, but in view of the great crowding in recent years, because means of transportation have become easier, and people 
    come from all over the world, and travel has become safer, and because men and women mix during tawaaf and in the places of worship, and because 
    many of them do not avoid causing fitnah – we think that not repeating Hajj is better for them, and safer for their religious commitment, and less 
    likely to cause harm to the society which may be tempted by some of them. Similarly men should avoid repeating Hajj frequently, so as to leave 
    more space for the pilgrims and to reduce the crowding. We hope that their reward for not doing it will be greater than the reward of Hajj, if 
    this is the intention.