Abu Bakr bin Abdullah bin al-Zubayr (may Allah have mercy on him) narrated from his grandmother (though I am not certain whether she was Asma bint Abi Bakr or Su'da bint Awf) that the Messenger of Allah (peace and blessings be upon him) came to Duba'ah bint al-Zubayr bin Abd al-Muttalib (may Allah be pleased with her) and said: "O aunt, what prevents you from Hajj?" She said: I am a sick woman, and I fear being held back on the way. He (peace and blessings be upon him) said: "Then enter ihram and make the condition that my place of leaving ihram is wherever You hold me back."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20604