Millet had a near-drowning experience at the age of 5 years, following which her father insisted she overcame her fear and learn how to swim.

[1] In 1994, while still a sub-junior, Millet won all five freestyle gold medals at the Senior National Level and beat India's top swimmers.

The same year, she also won her first international medal at the Asian Age Group Championships in Hong Kong.

At the peak of her career, Millet represented India at the 2000 Sydney Olympics in the 200m freestyle, where she won her heat, but failed to qualify for the semi-finals.

After undergoing back surgery in 2002, she narrowly missed out on the 2004 Olympic qualification and decided to retire from competitive swimming due to the heavy financial burden on her parents.