Appointing someone is correct due to a legislated Justification
Question :
Verily, both my mother and my two sisters appointed me to stone the pillars for them and that was due to fear of the intense crowding. Is that correct? May Allâh reward you with good.
Answer:
Appointing someone (to do the stoning) is correct if the women are unable to stone due to the severe crowding or if they are ill or they have some other justification from the legislated justifications.
Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 4 Page 258