Kaur along with her supporters joined Congress at a function in the presence of state party chief Partap Singh Bajwa.
Kaur, is the wife of Baba Ram Singh a Akali leader of Majha area.
On the occasion, she condemned the "anti-people" policies of the Shiromani Akali Dal.
Bajwa welcomed Kaur into the partyfold and said her presence would strengthen Congress in the state.
Many senior Akali leader were ready to quit the party, the Congress leader claimed.