It is narrated from Aishah (may Allah be pleased with her) that Fatimah and Abbas (may Allah be pleased with them both) came to Abu Bakr (may Allah be pleased with him) seeking their inheritance from the Messenger of Allah (peace and blessings be upon him), and at that time they were both asking for his land at Fadak and his share from Khaybar. Abu Bakr (may Allah be pleased with him) said to them: I heard the Messenger of Allah (peace and blessings be upon him) say: "We are not inherited from; whatever we leave is charity; the family of Muhammad only eat from this wealth." And I too will do whatever the Messenger of Allah (peace and blessings be upon him) used to do. Fatimah (may Allah be pleased with her) became angry and left Abu Bakr (may Allah be pleased with him), and she did not speak to him until she died. Ali (may Allah be pleased with him) buried her at night and did not inform Abu Bakr (may Allah be pleased with him). Aishah (may Allah be pleased with her) says: During the life of Fatimah (may Allah be pleased with her), Ali (may Allah be pleased with him) had standing among the people; when Fatimah (may Allah be pleased with her) died, the people's faces turned away from him. Ma'mar (may Allah have mercy on him) says: I asked al-Zuhri (may Allah have mercy on him): "How long did Fatimah (may Allah be pleased with her) live after the Messenger of Allah (peace and blessings be upon him)?" He said: "Six months." A man said to al-Zuhri (may Allah have mercy on him): "Did Ali (may Allah be pleased with him) not pledge allegiance until Fatimah (may Allah be pleased with her) died?" He said: "Nor did anyone of Banu Hashim."
The statement of al-Zuhri about Ali refraining from the pledge to Abu Bakr (may Allah be pleased with him) until Fatimah (may Allah be pleased with her) died is munqati' (broken). The hadith of Abu Sa'id al-Khudri (may Allah be pleased with him) about his pledging allegiance to him when the general pledge was given after al-Saqifah is more authentic. Perhaps al-Zuhri meant his holding back from it after the pledge, then his rising to it a second time and his carrying out its obligations, and Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 12732