She was the mother of Maharani Datar Kaur, one of the wives of Maharaja Ranjit Singh, the founder of the Sikh Empire.
[7] At the time of his death the Misl controlled Baharwal, Bucheki, Changa Manga, Chhichha, Chunian, Chunian, Dhaulri, Dipalpur, Faridabad, Fatahpur, Gugaira, Harappa, Jambar, Jethpur, Kanganpur, Khudian, Pakpattan, Raiwind, Chichawatni, Fatehabad, Killianwala, Kot Kamalia, Sahiwal, Syedwala, Sharakpur, Shergarh.
[8] During the course of their marriage Sardar Ran Singh and Sardarni Karmo Kaur became parents to four children, 3 sons and a daughter.
In an attempt to mislead her, Wazir Singh claimed that the Nakai Sandhu Jatts are superior to the Sukerchakias, but Sardarni Karmo Kaur refused to break off the match and stated as Sikhs we are all equal.
[20] In 1797, Nakais assisted the then Sardar Ranjit Singh of the Sukerchakia Misl to expel the attempts of Shah Zaman to annex Punjab region into his control through his general Shahanchi Khan and 12,000 soldiers.
While they were busy fighting in Lahore, Muzaffar Khan, Shah's relative and governor of Multan province, took advantage of the situation and took Syedwala.
In 1799, Nakais helped Ranjit Singh and Sada Kaur liberate Lahore from the Bhangi Sardars.
Datar Kaur took an active interest in the affairs of the State, and being the mother of Ranjit Singh's eldest sons- who became first and second in the line of succession to The throne of Punjab, she became his chief consort.