My husband stoned the pillars on my behalf during Hajj due to the crowd, and on the 13th day I took the precautionary measure and stoned every pillar with 21 pebbles. What is the ruling on my action?

Question:
She says: I performed Hajj with my husband, and when it came time to stone the pillars, my husband stoned them on my behalf due to the severe crowd. I stoned the pillars myself on the third day of the days of Tashriq, as there was no crowd at that time. Acting on the precautionary measure, I stoned every pillar with twenty-one pebbles, starting with the small pillar, and I stoned the Pillar of Aqabah with twenty-eight pebbles. Is stoning the pillars in this manner permissible or not? And what is required of her? May Allah reward you with good.

Answer:
First, appointing an agent to perform the stoning of the pillars when there is a need is permissible, and praise be to Allah. If there is severe crowding and the woman is in danger from entering, there is no harm in her appointing someone to stone on her behalf, and if he stones on her behalf, it is sufficient, and praise be to Allah. The same applies to the elderly patient, and to the child who cannot handle the crowding or cannot walk to the pillars if their homes are far from them due to their weakness; there is no harm in their appointing an agent, for Allah, Glorified and Exalted is He, said: So this woman who appointed her husband during the severe crowding, and he stoned on her behalf, his stoning on her behalf is valid and certain, if Allah wills, because she had an excuse. As for what she did when she found space on the third or second day and stoned for the past days, that was her independent legal reasoning (ijtihad). Otherwise, her husband’s stoning on her behalf is sufficient because she was in a state of excuse. However, if someone wants to stone for the past days because he had not previously stoned, or because he was idle while he was able to stone and had no excuse, is the way to do it as this woman did, where she stones twenty-one pebbles on each pillar for the past days? No, rather he must stone for the first day starting with the first pillar, which is the small one, then return a second time for the second day and start with the small one, then the middle one, then the large one, seven pebbles for each pillar, then return for the third day and start with the small one, then the middle one, then the large one, seven pebbles for each pillar.