A: Firstly:
It is known that one of
the conditions of the validity of a woman's Hajj is the presence of a Mahram with her during Hajj. So for a woman who does not have a Mahram to perform Hajj with, the obligation of Hajj is waived in her case until she finds a Mahram. The woman who performs Hajj with a non-Mahram (not a spouse or an unmarriageable relative), her Hajj is valid but she has to offer Tawbah (repentance to Allah) because of her traveling without a Mahram, for such an act is a wrongdoing and a sin. This is according to the saying of the Prophet (peace be upon him):
A woman should not travel except with a Dhu-Mahram (her husband or a man with whom she cannot marry at all according to the Islamic Jurisprudence)
(Sahih [authentic] - agreed upon by Al-Bukhari and Muslim). (Part No. 10; Page No. 326)
Secondly:
As for
appointing another person to throw on one's behalf, it is obligatory upon the pilgrim to throw the pebbles themselves when they are able to do so. Whoever is unable to do so such as a sick person or an old or physically disabled woman, then it is permissible for them to appoint others to throw the pebbles on their behalf.
Thirdly:
According to what is mentioned above, if you were unable to throw the pebbles at the time that you appointed someone else to do so on your behalf, then the appointing is valid and you do not have to do anything. But if you were able to throw the pebbles during your first and second Hajj, then you have to offer a Fidyah (ransom) that should be slaughtered in
Makkah and that meets the same conditions for an Ud-hiyah (sacrificial animal offered by non-pilgrims). Its meat should be distributed among the poor there. This ruling is with regard to appointing another person to throw on your behalf during your first Hajj if you were able to do so. If you cannot afford a sacrificial animal, then you have to fast ten days. The same is also applied to appointing another person to throw on your behalf during your second Hajj whether you were able to do so or not.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.