Then followed Zaid ibn Haritha’s detachment to Umm Qirfa in the area of Wadi Al-qura, seven nights from Medina, in the month of Ramadan in the sixth year of the Messenger of Allah’s (SAW) emigration [hijra]. Zaid ibn Harith set out to do some commerce in Sham, and he had some of the merchandise of the Prophet’s (SAW) Companions with him. And as they approached Wadi Al-qura, some men from Fazara of the Banu Badr faced him, assaulted him, assaulted his companions, and took what they had with them. Zaid recovered from his injuries, went to see the Messenger of Allah (SAW), and told him; the Messenger of Allah (SAW) sent him back out against them. They took cover during the day and moved at night, but the Banu Badr were on their guard against them. Then Zaid and his companions came to them in the morning, declared takbir [“Allahu akbar!”], surrounded those who were present, and took Umm Qirfa – Fatimah bint Rabi’a ibn Badr – and her daughter, the servant girl of the daughter of Malik ibn Hudhaifa ibn Badr; the one who took the servant girl was Maslama ibn Al-Akwa’; he gave her to the Messenger of Allah (SAW) and the Messenger of Allah then gave her to Hazn ibn Abi Wahb. Qais ibn Al-Muhassir proceeded to Umm Qirfa – she was a very old woman – and he killed her violently: he tied a rope between her legs, then tied her between two camels, then goaded the camels on; they set off and tore her apart. Nu’man and ‘Ubaid Allah killed the two sons of Mas’ada ibn Hakama ibn Malik ibn Badr. Zaid ibn Haritha returned from this mission of his, and knocked on the Prophet’s (SAW) door. And He got up to meet him, naked, dragging his robe, embracing him and kissing him. And He asked him, and he told him of the victory Allah had given him.
In Sharh Al-mawahib Al-ladunniyya by Al-Zurqani: Indeed Zaid killed her like this for insulting the Messenger of Allah (SAW); it is said: and because she got thirty riders ready from her sons and the sons of her sons, and said: Go raid Medina, and kill Muhammad.