Why was Zaynab bint Khuzaymah Al-Hilaliyyah titled "Umm Al-Masakeen" (Mother of the Poor)?

The reason for bestowing the title "Umm Al-Masakeen" (Mother of the Destitute) upon Umm Al-Mu'minin Zaynab bint Khuzaymah, may Allah be pleased with her, is her kindness and generosity towards the destitute in both the pre-Islamic era (Jahiliyyah) and Islam. She was renowned for this, and it became her honorific. Abd Al-Razzaq said: "She was the best of his wives (peace be upon him) towards the destitute."