I do not know whether it was because of the fasting (or for any other reason) that he (the Holy Prophet) refused to accept that. She raised her voice and showed annoyance to him.
Sahih Muslim Book 44, Hadith 147
← Previous Hadith One who has the longest hands amongst you would meet me most immediately. She farther said: They (the wives of Allah's Apostle) used to measure the hands as to whose hand was the longest and it was the hand of Zainab that was the longest amongst them, as she used to work with her hand and Spend (that income) on charity.

Sahih Muslim Book 44, Hadith 146 Next Hadith → Let us visit Umm Aiman as Allah's Messenger (ﷺ) used to visit her. As we came to her, she wept. They (Abu Bakr and Umar) said to her: What makes you weep? What is in store (in the next world) for Allah's-Messenger (ﷺ) is better than (this worldly life). She said: I weep not because I am ignorant of the fact that what is in store for Allah's Messenger (ﷺ) (in the next world) is better than (this world), but I weep because the revelation which came from the Heaven has ceased to come. This moved both of them to tears and they began to weep along with her.

Sahih Muslim Book 44, Hadith 148