A Deputy Superintendent of Police (DSP) in the Punjab Police, Manjeet competed for India in 4 x 400 metres relay at 2004 Athens Olympics where her team set the current National record with a time of 3:26.89.[1] The team finished third in their heats.[5] In the next Beijing Olympics also she represented India in 4 x 400 metres relay where her team composed of Sathi Geetha, Chitra K. Soman, and Mandeep Kaur clocked a time of 3:28.83 and finished seventh in their heats.[6]
In Doha Asian Games in 2006, Manjeet led India to a 4 x 400 metres relay gold.[7] Earlier at the same event, she had also won a silver medal in Women's 400 metres race behind eventual winner Olga Tereshkova from Kazakhstan. In 2005, she was conferred the Arjuna Award for her contribution to the Indian athletics.[8]