(a) Sayyidah Aishah (may Allah be pleased with her) said: We set out with the Prophet (peace and blessings be upon him) in the year of the Farewell Hajj, and I made the talbiyah for Umrah, and I had not brought a sacrificial animal. The Prophet (peace and blessings be upon him) said: "Whoever has a sacrificial animal with him should make the talbiyah for Hajj along with his Umrah, and then not leave ihram until he has finished both of them." She said: Then I began menstruating, and when the night of Arafah came, I said: O Messenger of Allah (peace and blessings be upon him)! I had made the talbiyah for Umrah, so what should I now do about my Hajj? He (peace and blessings be upon him) said: "Undo your hair, comb it, hold back from the Umrah and make the talbiyah for Hajj." When I had completed my Hajj, he ordered Abd al-Rahman bin Abi Bakr (may Allah be pleased with them both), and he had me perform Umrah from al-Tan'im in place of the Umrah from which I had been held back.
(b) This contains evidence that the Prophet (peace and blessings be upon him) ordered those who had sacrificial animals to make the talbiyah for Hajj along with Umrah, and he ordered Sayyidah Aishah (may Allah be pleased with her) to do the same even though she had no sacrificial animal, out of fear that her Hajj would be missed. Then he (peace and blessings be upon him) slaughtered cows on behalf of his wives. The narration of Abu al-Zubayr from Jabir establishes decisively that she was performing Qiran, and it has been mentioned before.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8776